High-temperature green lanthanum color glaze and preparation method thereof

Abstract

The invention discloses a high-temperature green glaze and a preparation method thereof, and belongs to the technical field of high-temperature colored glazes. The high-temperature marble colored glaze comprises a basic glaze and a color former, the basic glaze is composed of potassium feldspar, quartz, kaolin, calcite, talcum powder and zinc oxide, and the color former is composed of zirconite, dolomite, chromic oxide, blue copper ore, pearlite, praseodymium oxide, cerium oxide and vanadium pentoxide. By adjusting the formula raw materials and controlling the firing process, the green glaze which is natural, attractive, glittering and translucent in luster, has a lake light mountain color and also has high hardness, high wear resistance, heat resistance and the like is prepared, the glaze surface is high in compactness and good in stability, and the green glaze can be widely applied to the fields of tea ware, tableware, decoration, industry and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of high-temperature colored glazes, and in particular relates to a high-temperature clear colored glaze and a preparation method thereof. Background Art

[0002] The preparation of colored glazes is one of the most visually expressive techniques in ceramic decoration. By adding metal oxides as colorants to the glaze and combining them with specific firing conditions, the glaze layer can exhibit a variety of colors, including red, blue, green, purple, black, and indigo. High-temperature colored glazes offer a rich variety of expressions. They can be used as a creative medium independently or in combination with other materials to create a wider range of artistic forms. By combining colored glazes with elements such as blue and white, overglaze colors, and colorants, or integrating them with other artistic forms such as ceramics and calligraphy, the resulting images can be more vivid, creative, and artistically appealing.

[0003] Traditional colored glazes include celadon (using ferrous iron as a colorant), red (using cuprous oxide), and blue (using cobalt). The key difference between colored glazes and ordinary glazes lies in the choice of raw materials used in the glaze formulation and the specialized high-temperature firing process required to create these vibrant colors. However, achieving specific glaze colors and textures often requires the addition of a variety of different metal oxides as colorants, making the firing process increasingly difficult to control. While achieving the desired glaze color, this can easily lead to uneven color, pinholes, bubbles, and reduced wear or heat resistance. Summary of the Invention

[0004] In view of the content mentioned in the background technology, the purpose of the present invention is to provide a high-temperature Qinglan colored glaze and a preparation method thereof. By adjusting the formula raw materials and controlling the firing process, the present invention prepares a Qinglan colored glaze that is naturally beautiful, glossy and crystal clear, like the scenery of lakes and mountains, while also taking into account high hardness, high wear resistance, heat resistance, etc.

[0005] To achieve the above object, the present invention specifically adopts the following technical solutions: The present invention provides a high-temperature clear colored glaze, comprising a base glaze and a colorant, which are respectively composed of the following raw materials in parts by weight: Base glaze: potassium feldspar 40-52 parts, quartz 18-26 parts, kaolin 13-19 parts, calcite 5-11 parts, talc 3-8 parts, zinc oxide 2-5 parts; Coloring agent: 14-20 parts of zircon, 4-7 parts of dolomite, 3.5-4.8 parts of chromium oxide, 1.2-1.4 parts of azurite, 0.05-0.15 parts of pearlite, 0.18-0.3 parts of praseodymium oxide, 0.15-0.45 parts of cerium oxide, and 0.12-0.28 parts of vanadium pentoxide.

[0006] Furthermore, the mass ratio of the base glaze to the colorant is (86-92):(8-14).

[0007] Furthermore, the colorant is composed of the following raw materials in parts by weight: 16 parts of zircon, 6 parts of dolomite, 4.2 parts of chromium oxide, 1.4 parts of azurite, 0.08 parts of pearlite, 0.26 parts of praseodymium oxide, 0.3 parts of cerium oxide, and 0.22 parts of vanadium pentoxide.

[0008] The present invention also provides a method for preparing the above-mentioned high-temperature clear colored glaze, comprising the following steps: Step 1: Weigh the raw materials of base glaze and colorant according to the formula, crush them and set aside; Step 2: Mix the base glaze and colorant powder, add water and ball grind to obtain glaze slurry for later use; Step 3: Take the glaze slurry and glaze the surface of the ceramic clay. After drying, transfer it into the furnace and fire it at a high temperature of 1290-1330℃. After cooling, you can get Qinglan colored glaze porcelain.

[0009] Furthermore, after the powders in step 2 are mixed, water is added and ball-milled with a material-water ratio of (4-5):(6-8):1, and the ball milling speed is 400-500 rpm, and the ball milling is performed to a particle size of D 50 The particle size is 2-4 μm; after ball milling, the glaze slurry density needs to be adjusted to 1.60-1.64 g / mL.

[0010] Furthermore, the raw material formula of the ceramic mud blank in step three is: 35-45 parts by weight of kaolin, 30-40 parts by weight of talc, 15-24 parts by weight of feldspar, 5-10 parts by weight of quartz, and 3-6 parts by weight of bentonite; its firing parameters are: heating rate 4-5°C / min, heating to 900-950°C and keeping warm for 20-40 min, and cooling to room temperature with the furnace.

[0011] Furthermore, the glazing method in step three is dipping glaze, and the coating thickness is 0.4 mm.

[0012] Furthermore, the high-temperature firing in step three adopts programmed temperature rise, and the specific operation is: first, air is introduced into the furnace, and the temperature is raised from room temperature to 400-420°C at 100-120°C / h, and then the temperature is raised to 920-960°C at 250-300°C / h, and kept warm for 20-30 min; then the air intake is reduced, additional carbon is added, the CO content in the atmosphere is controlled to 3%, and the temperature is continued to be raised to 1060-1100°C at 100-120°C / h; finally, the additional carbon addition is stopped to eliminate CO, and the temperature is continued to be raised to 1290-1330°C at 60-80°C / h, and kept warm for 30-40 min.

[0013] Furthermore, after the high-temperature firing in step 3 is completed, the temperature is first lowered to 650-700°C at 80-100°C / h, and then cooled to room temperature along with the furnace.

[0014] Furthermore, the glaze layer color of the obtained Qinglan colored glaze porcelain is: L*=41.9~44.3, a*=-43.1~-41.2, b*=-24.4~-23.2.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The colorants of the present invention are based on chromium oxide, azurite, and chalcopyrite as the core, while praseodymium oxide, cerium oxide, and vanadium pentoxide are introduced as auxiliary colorants to synergistically produce a blue-green transition, thereby obtaining the target clear blue color. The present invention mixes the selected colorants with a base glaze in an appropriate proportion to form a glaze, and also provides a blank. The glaze slurry made from the glaze is dip-coated onto the surface of a previously formed and bisque-fired ceramic clay blank, and then undergoes a two-stage firing process. The selected base glaze not only provides an ideal melting environment and protective layer for the colorants, but also promotes their uniform dispersion and stable coloring. The blank primarily matches the colorants and base glaze, thereby stabilizing the glaze layer and reducing defects.

[0016] 2. The two-stage firing of the present invention adopts a staged temperature-raising firing process. By fine-tuning the light oxidation / light reduction / neutral atmosphere at the corresponding temperature stage, a pure and full blue-green color is obtained, which avoids bubble and pinhole defects while also improving the hardness, wear resistance and thermal shock resistance of the product.

[0017] 3. The chromaticity of the Qinglan color glaze prepared by the present invention is stable between L*=41.9~44.3, a*=-43.1~-41.2, and b*=-24.4~-23.2. It is like the scenery of lakes and mountains, naturally beautiful, restrained and calm. It is not only beautiful but also has high hardness, high wear resistance, heat resistance and other functionalities. It can be widely used in many fields such as tea sets, tableware, decoration, and industry. DETAILED DESCRIPTION

[0018] To make the objects, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be described clearly and completely below in conjunction with the examples. Where specific conditions are not specified in the examples, the experiments were carried out under conventional conditions or the conditions recommended by the manufacturer. Where the manufacturer of the reagents or instruments is not specified, all are commercially available conventional products.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art in the art. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0020] Example 1 A method for preparing high-temperature clear color comprises the following steps: 1. Weigh 46 parts of potassium feldspar, 24 parts of quartz, 15 parts of kaolin, 7 parts of calcite, 6 parts of talc, and 4 parts of zinc oxide by weight, and grind and mix them to form the basic glaze powder. Weigh 16 parts of zircon, 6 parts of dolomite, 4.2 parts of chromium oxide, 1.4 parts of azurite, 0.08 parts of chalcopyrite, 0.26 parts of praseodymium oxide, 0.3 parts of cerium oxide, and 0.22 parts of vanadium pentoxide, and grind and mix them to form the colorant powder. Mix the above basic glaze powder and colorant powder in a mass ratio of 9:1. Add water and zirconium oxide balls to the resulting mixed powder for wet grinding. The ratio of material, balls, and water is 4:6:1. Ball mill at 500 rpm to a particle size of D 50 The obtained glaze slurry was sieved to remove iron, allowed to stand for 48 hours to age, and the specific gravity was adjusted to 1.62 g / mL for later use.

[0021] 2. Weigh 40 parts of kaolin, 35 parts of talc, 20 parts of feldspar, 8 parts of quartz, and 5 parts of bentonite by weight, crush and mix them, add water and zirconium oxide balls for wet grinding, the material, ball, and water ratio is 4:5:1, and ball mill at 500 rpm to a particle size of D 50 The obtained mud was sieved to remove iron, dehydrated (water content 20%), and allowed to stand for 30 hours for aging. The obtained mud was pressed into a mold (25 MPa) and transferred into a furnace under air atmosphere, heated from room temperature to 920°C at a rate of 4°C / min and kept at that temperature for 30 minutes for bisque firing. It was then cooled to room temperature in the furnace to obtain a ceramic mud blank.

[0022] 3. Apply the glaze slurry evenly to the surface of the ceramic clay (0.4 mm thick) by dipping. After drying, transfer the clay to a furnace for programmed heating: First, introduce air into the furnace (control the O2 content in the atmosphere to 1.5%) and heat it from room temperature to 420°C at a rate of 120°C / h, then to 950°C at a rate of 250°C / h, and hold it for 25 minutes. Then, reduce the air flow, add additional carbon, control the CO2 content in the atmosphere to 3%, and continue heating at 100°C / h to 1100°C. Finally, stop adding additional carbon to eliminate CO (control the O2 content in the atmosphere to no more than 0.01%), continue heating at 70°C / h to 1310°C, and hold it for 40 minutes. After firing, cool it down at 90°C / h to 680°C, then cool it to room temperature in the furnace to obtain the Qinglan colored glaze porcelain product.

[0023] Example 2 A method for preparing high-temperature clear color comprises the following steps: 1. Weigh 40 parts of potassium feldspar, 18 parts of quartz, 13 parts of kaolin, 5 parts of calcite, 3 parts of talc, and 2 parts of zinc oxide by weight, and grind and mix them to form the basic glaze powder. Weigh 14 parts of zircon, 4 parts of dolomite, 3.5 parts of chromium oxide, 1.2 parts of azurite, 0.05 parts of chalcopyrite, 0.18 parts of praseodymium oxide, 0.15 parts of cerium oxide, and 0.12 parts of vanadium pentoxide, and grind and mix them to form the colorant powder. Mix the above basic glaze powder and colorant powder in a mass ratio of 92:8. Add water and zirconium oxide balls to the resulting mixed powder for wet grinding. The ratio of material, balls, and water is 4:8:1. Ball mill at 500 rpm to a particle size of D 50 The obtained glaze slurry was sieved to remove iron, allowed to stand for 48 hours to age, and the specific gravity was adjusted to 1.6 g / mL for later use.

[0024] 2. Weigh 35 parts of kaolin, 30 parts of talc, 15 parts of feldspar, 5 parts of quartz and 3 parts of bentonite by weight, crush and mix them, add water and zirconium oxide balls for wet grinding, the material, ball and water ratio is 4:5:1, and ball mill at 500 rpm to a particle size of D 50 The obtained mud was sieved to remove iron, dehydrated (water content 20%), and allowed to stand for 30 hours for aging before use; the obtained mud was pressed into a mold (25 MPa) and transferred into a furnace under air atmosphere, heated from room temperature to 900°C at a rate of 5°C / min and kept at that temperature for 40 minutes for bisque firing, and then cooled to room temperature with the furnace to obtain a ceramic mud blank.

[0025] 3. Apply the glaze slurry evenly to the surface of the ceramic clay (thickness 0.4 mm) by dipping. After drying, transfer the clay to a furnace for programmed temperature increase: First, introduce air into the furnace (control the O2 content in the atmosphere to 1.5%) and heat it from room temperature to 420°C at a rate of 120°C / h, then to 960°C at a rate of 300°C / h and hold for 20 minutes. Then, reduce the air flow, add additional carbon, control the CO2 content in the atmosphere to 3%, and continue to heat it at 100°C / h to 1060°C. Finally, stop adding additional carbon to eliminate CO (control the O2 content in the atmosphere to no more than 0.01%), continue to heat it at 80°C / h to 1330°C, and hold it for 30 minutes. After firing, cool it down to 700°C at a rate of 100°C / h, and then cool it to room temperature in the furnace to obtain the Qinglan colored glaze porcelain product.

[0026] Example 3 A method for preparing high-temperature clear color comprises the following steps: 1. Weigh 52 parts of potassium feldspar, 26 parts of quartz, 19 parts of kaolin, 11 parts of calcite, 8 parts of talc, and 5 parts of zinc oxide by weight, crush and mix them to form the basic glaze powder. Weigh 20 parts of zircon, 7 parts of dolomite, 4.8 parts of chromium oxide, 1.3 parts of azurite, 0.15 parts of chalcopyrite, 0.3 parts of praseodymium oxide, 0.45 parts of cerium oxide, and 0.28 parts of vanadium pentoxide, crush and mix them to form the colorant powder. Mix the above basic glaze powder and colorant powder in a mass ratio of 86:14, add water and zirconium oxide balls to the resulting mixed powder for wet grinding, with the material, ball, and water ratio being 5:6:1, and ball mill at 400 rpm to a particle size of D 50 The obtained glaze slurry was sieved to remove iron, allowed to stand for 48 hours to age, and the specific gravity was adjusted to 1.64 g / mL for later use.

[0027] 2. Weigh 45 parts of kaolin, 40 parts of talc, 24 parts of feldspar, 10 parts of quartz and 6 parts of bentonite by weight, grind and mix them, add water and zirconium oxide balls for wet grinding, the material, ball and water ratio is 4:5:1, and grind at 500 rpm to a particle size of D 50 The obtained mud was sieved to remove iron, dehydrated (water content 20%), and allowed to stand for 30 hours for aging. The obtained mud was molded (25 MPa) and transferred into a furnace under air atmosphere, heated from room temperature to 950°C at a rate of 5°C / min and kept at that temperature for 20 minutes for bisque firing. Then, it was cooled to room temperature in the furnace to obtain a ceramic mud blank.

[0028] 3. Apply the glaze slurry evenly to the surface of the ceramic clay (0.4 mm thick) by dipping. After drying, transfer the clay to a furnace for programmed temperature increase: First, introduce air into the furnace (control the O2 content in the atmosphere to 1.5%) and heat it from room temperature to 400°C at 100°C / h, then increase the temperature to 920°C at 250°C / h and hold for 30 minutes. Then, reduce the air flow, add additional carbon, control the CO2 content in the atmosphere to 3%, and continue to heat it at 120°C / h to 1100°C. Finally, stop adding additional carbon to eliminate CO (control the O2 content in the atmosphere to no more than 0.01%), continue to heat it at 60°C / h to 1290°C and hold it for 40 minutes. After firing, cool it down at 80°C / h to 650°C, then cool it to room temperature in the furnace to obtain the Qinglan colored glaze porcelain product.

[0029] Comparative Example 1 Refer to the step parameters of Example 1, except that the raw materials of the colorant formula in step 1 are changed to: 16 parts of zircon, 6 parts of dolomite, 5.6 parts of chromium oxide, 0.08 parts of pearlite, 0.26 parts of praseodymium oxide, 0.3 parts of cerium oxide, and 0.22 parts of vanadium pentoxide.

[0030] Comparative Example 2 Refer to the step parameters of Example 1, except that the raw materials of the colorant formula in step 1 are changed to: 16 parts of zircon, 6 parts of dolomite, 4.2 parts of chromium oxide, 1.4 parts of azurite, 0.26 parts of praseodymium oxide, 0.3 parts of cerium oxide, and 0.22 parts of vanadium pentoxide.

[0031] Comparative Example 3 Refer to the step parameters of Example 1, except that the raw materials of the colorant formula in step 1 are changed to: 16 parts of zircon, 6 parts of dolomite, 4.2 parts of chromium oxide, 1.4 parts of azurite, 0.08 parts of pearlite, 0.3 parts of cerium oxide, and 0.22 parts of vanadium pentoxide.

[0032] Comparative Example 4 Refer to the step parameters of Example 1, except that the raw materials of the colorant formula in step 1 are changed to: 16 parts of zircon, 6 parts of dolomite, 4.2 parts of chromium oxide, 1.4 parts of azurite, 0.08 parts of pearlite, 0.26 parts of praseodymium oxide, and 0.3 parts of cerium oxide.

[0033] Comparative Example 5 Refer to the step parameters of Example 1, except that the programmed temperature rise and high-temperature firing steps in step 3 are adjusted as follows: first, air is introduced into the furnace (the O2 content in the atmosphere is controlled to be 1.5%), the temperature is raised from room temperature to 950°C at 120°C / h, and kept warm for 25 minutes; then the air intake is reduced, additional carbon is added, the CO content in the atmosphere is controlled to be 3%, and the temperature is continued to be raised to 1100°C at 100°C / h; finally, the additional carbon addition is stopped to eliminate CO (the O2 content in the atmosphere is controlled to be no more than 0.01%), and the temperature is continued to be raised to 1310°C at 70°C / h, and kept warm for 40 minutes.

[0034] Comparative Example 6 Refer to the step parameters of Example 1, except that the programmed temperature rise and high-temperature firing steps in step 3 are adjusted as follows: first, air is introduced into the furnace (the O2 content in the atmosphere is controlled to be 1.5%), the temperature is raised from room temperature to 420°C at 120°C / h, and then the temperature is raised to 950°C at 250°C / h, and kept warm for 25 min; then the air intake is reduced, additional carbon is added, the CO content in the atmosphere is controlled to be 6%, and the temperature is continued to be raised to 1100°C at 100°C / h; finally, the additional carbon addition is stopped to eliminate CO (the O2 content in the atmosphere is controlled to not exceed 0.01%), and the temperature is continued to be raised to 1310°C at 70°C / h, and kept warm for 40 min.

[0035] Comparative Example 7 Refer to the step parameters of Example 1, except that the programmed temperature increase and high-temperature firing steps in step 3 are adjusted as follows: first, air is introduced into the furnace (the O2 content in the atmosphere is controlled to be 1.5%), the temperature is increased from room temperature to 420°C at 120°C / h, and then the temperature is increased to 950°C at 250°C / h, and kept warm for 25 min; then the air intake is reduced, additional carbon is added, the CO content in the atmosphere is controlled to be 3%, and the temperature is continued to be increased to 1100°C at 100°C / h; the temperature is continued to be increased to 1310°C at 70°C / h, and kept warm for 40 min.

[0036] Test example The colored glaze porcelain samples prepared in Examples 1-3 and Comparative Examples 1-7 were tested, and the results are shown in Tables 1 and 2. (Lightness and chromaticity were tested in accordance with GB / T 4739-2015; wear resistance was tested using a Taber abrasion tester (500g load); lead and cadmium migration was tested in accordance with GB 31604.34-2016; water absorption was tested in accordance with GB / T 3299-2011; and thermal shock resistance was tested in accordance with GB / T 3298-2022.) Table 1 Appearance and chromaticity of sample glaze

[0037] Table 2 Sample performance test results

[0038] The glaze appearance and chromaticity data for the samples in Table 1 indicate that the present invention produces a smooth, pure, uniform, and warm blue-green glaze, Qinglan Colored Glaze, with chromaticity ranging from L*=41.9 to 44.3, a*=-43.1 to -41.2, and b*=-24.4 to -23.2. The glaze, reminiscent of the scenery of lakes and mountains, is naturally beautiful, restrained, and composed. The performance test results for the samples in Table 2 indicate that the present invention achieves high quality while satisfying the desired glaze color. It also combines functional properties such as high hardness, high wear resistance, and heat resistance, making it suitable for a wide range of applications, including teaware, tableware, decoration, and industrial applications.

[0039] The embodiments described above merely represent several preferred embodiments of the present invention. While the descriptions are relatively specific and detailed, they are not intended to limit the present invention. It should be noted that those skilled in the art will readily appreciate that the present invention is susceptible to various variations and modifications. Any modifications, equivalent substitutions, or improvements within the scope of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A high-temperature clear colored glaze, characterized in that: It includes basic glaze and colorant, and is composed of the following raw materials by weight: Base glaze: potassium feldspar 40-52 parts, quartz 18-26 parts, kaolin 13-19 parts, calcite 5-11 parts, talc 3-8 parts, zinc oxide 2-5 parts; Coloring agent: zircon 14-20 parts, dolomite 4-7 parts, chromium oxide 3.5-4.8 parts, azurite 1.2-1.4 parts, pearlite 0.05-0.15 parts, praseodymium oxide 0.18-0.3 parts, cerium oxide 0.15-0.45 parts, vanadium pentoxide 0.12-0.28 parts; The mass ratio of the base glaze to the colorant is (86-92):(8-14).

2. The high-temperature clear colored glaze according to claim 1, characterized in that: The colorant is composed of the following raw materials in parts by weight: 16 parts of zircon, 6 parts of dolomite, 4.2 parts of chromium oxide, 1.4 parts of azurite, 0.08 parts of pearlite, 0.26 parts of praseodymium oxide, 0.3 parts of cerium oxide, and 0.22 parts of vanadium pentoxide.

3. The method for preparing the high-temperature clear colored glaze according to claim 1 or 2, characterized in that: The steps include: Step 1: Weigh the raw materials of base glaze and colorant according to the formula, crush them and set aside; Step 2: Mix the base glaze and colorant powder, add water and ball grind to obtain glaze slurry for later use; Step 3: Take the glaze slurry and glaze the surface of the ceramic clay. After drying, transfer it into the furnace and fire it at a high temperature of 1290-1330℃. After cooling, you can get Qinglan colored glaze porcelain.

4. The method for preparing the high-temperature clear colored glaze according to claim 3, characterized in that: Step 2: After mixing the powder, add water and ball mill with a material-water ratio of (4-5): (6-8): 1, and the ball mill speed is 400-500 rpm, and the ball mill is milled to a particle size of D 50 The particle size is 2-4 μm, and the glaze slurry density needs to be adjusted to 1.60-1.64 g / mL after ball milling.

5. The method for preparing the high-temperature clear colored glaze according to claim 3, characterized in that: The raw material formula of the ceramic mud blank in step 3 is: 35-45 parts by weight of kaolin, 30-40 parts by weight of talc, 15-24 parts by weight of feldspar, 5-10 parts by weight of quartz, and 3-6 parts by weight of bentonite; its firing parameters are: heating rate 4-5°C / min, heating to 900-950°C and keeping warm for 20-40 minutes, and cooling to room temperature with the furnace.

6. The method for preparing the high-temperature clear colored glaze according to claim 3, characterized in that: The glazing method in step 3 is dipping glaze, and the coating thickness is 0.4 mm.

7. The method for preparing the high-temperature clear colored glaze according to claim 3, characterized in that: The high-temperature firing described in step 3 adopts programmed temperature rise, and the specific operation is: first, air is introduced into the furnace, and the temperature is raised from room temperature to 400-420°C at 100-120°C / h, and then the temperature is raised to 920-960°C at 250-300°C / h, and kept warm for 20-30 min; then the air intake is reduced, additional carbon is added, the CO content in the atmosphere is controlled to 3%, and the temperature is continued to be raised to 1060-1100°C at 100-120°C / h; finally, the additional carbon addition is stopped to eliminate CO, and the temperature is continued to be raised to 1290-1330°C at 60-80°C / h, and kept warm for 30-40 min.

8. The method for preparing high-temperature clear colored glaze according to claim 3, characterized in that: Step 3: After high temperature firing is completed, the temperature is first lowered to 650-700℃ at 80-100℃ / h, and then cooled to room temperature along with the furnace.

9. The method for preparing high-temperature clear colored glaze according to claim 3, characterized in that: The glaze layer color of the obtained Qinglan colored glaze porcelain is: L*=41.9~44.3, a*=-43.1~-41.2, b*=-24.4~-23.2.

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