Blue sun-drying eliminating liquid

Abstract

The invention discloses a high-efficiency, mild, environment-friendly and controllable blue drying process elimination liquid and a preparation method thereof. The main components of the blue sun-curing agent are ammonium ferric citrate and potassium ferricyanide, and the ammonium ferric citrate and the potassium ferricyanide are subjected to photochemical reaction under ultraviolet light illumination to present blue color. And the blue light eliminating liquid can eliminate the imaging of blue light after ultraviolet rays. A proper pH environment (8.8) is provided by a sodium carbonate / sodium bicarbonate buffer system with a specific ratio, efficient decomposition of Prussian blue in blue-sun imaging can be completely realized within 3-5 minutes in combination with a metal ion chelation effect of EDTA-2Na and a permeation enhancement effect of DMSO, and the elimination liquid has the characteristics of mild action and wide substrate compatibility, and does not damage substrates such as paper and fabrics. The method is suitable for the fields of art, photography, culture restoration and chemical preparations.

Description

Technical Field

[0001] The present invention relates to chemical treatment and image restoration technologies, particularly a solution formulated based on NaHCO3 (sodium bicarbonate), which can be used for the elimination, adjustment, or restoration of imaging in the Cyanotype process, and the field of reprocessing applications of Cyanotype art. The present invention belongs to the technical fields of art, photography, cultural relic restoration, and chemical preparations, and specifically relates to an efficient eliminating solution for removing residual images in the Cyanotype process and its preparation method. Background Art

[0002] Cyanotype is a time-honored photochemical imaging technology that mainly utilizes the development reaction of Prussian Blue (Fe4[Fe(CN)6]3·xH2O) formed by ammonium ferric citrate and potassium ferricyanide (K3[Fe(CN)6]) under ultraviolet light irradiation. However, in practical applications, Cyanotype imaging may need to be partially or completely eliminated due to incorrect exposure, accidental contamination, image adjustment, or artistic requirements. Currently, conventional elimination methods have obvious defects: 1. Conventional chemical reduction (such as treatment with dilute hydrochloric acid): Although it can dissolve Prussian Blue (Fe4[Fe(CN)6]3), it causes the paper to become acidified and brittle; 2. Hydrogen peroxide oxidation method: The reaction rate is slow, and the generation of bubbles damages the fiber structure; 3. Commercial eliminators: Most contain irritating components such as sodium sulfite and sodium bisulfite, and the operation safety is low. However, these methods have problems such as strong corrosiveness, inaccurate control, and easy damage to paper or fabric. Developing a convenient, controllable, and non-damaging Cyanotype image elimination reagent is of great significance. Summary of the Invention

[0003] Objective: The objective of the present invention is to provide a method for eliminating Cyanotype imaging and its preparation method to solve the problem that Cyanotype imaging in the prior art cannot be completely, efficiently, and gently eliminated.

[0004] Reagent formula: The reagent of the present invention is composed of the following components (calculated by mass percentage): (1) Weak basic regulator (sodium bicarbonate NaHCO3) content is not less than 99.8%, 9.6 g.

[0005] (2) Basic regulator (sodium carbonate Na2CO3) 99.8%, 21.5 g.

[0006] (3) Distilled water (H2O) 100 mL.

[0007] (4) Chelating agent (ethylenediaminetetraacetic acid EDTA): 2 g.

[0008] (5)Penetrant (dimethyl sulfoxide): 2 g.

[0009] Principle of action: (1)Weak base action: NaHCO3 can make the solution slightly alkaline (pH 8 - 9), promoting the decomposition of Prussian blue while avoiding damage to the substrate caused by excessive strong alkalinity.

[0010] (2)Alkaline regulator (sodium carbonate Na2CO3) (pH about 11.5) provides an alkaline environment for the gradual decomposition of Prussian blue. Only 43.2% is added to the reagent to accelerate the reaction time of the reagent.

[0011] (3)Chelating agent action: EDTA can preferentially bind to Fe²⁺ ions in free Prussian blue, prevent secondary color development, and make it gradually dissolve, causing the image to fade.

[0012] (4)Penetration effect: Dimethyl sulfoxide can improve the penetration ability of the solvent, enabling the reagent to act faster on the deep layer of the image and enhancing the permeability of the solution to paper or fabric).

[0013] Experimental verification: Experiment 1: Currently, it is known that traditional alkaline systems (sodium carbonate / sodium bicarbonate) have an elimination effect on cyanotype imaging. However, their reaction times are different, the elimination effects are different, and the pH values are also different. Among them, ethylenediaminetetraacetic acid (EDTA) can dissolve Fe²⁺ ions in cyanotype, and the penetrant dimethyl sulfoxide can improve the penetration ability, which can enhance the speed and effect of cyanotype imaging elimination to varying degrees. In order to enable it to efficiently eliminate cyanotype imaging, a comparative experiment was conducted on different mixed additions of the four substances to compare the elimination effects of different reagents on cyanotype imaging under different media. (Taking sketch paper, silk, cotton cloth, and rice paper as examples) The results are as follows: Scoring criteria: Degree of color elimination (0 - 5 points): 0 = no change, 5 = color completely eliminated. Elimination speed (0 - 5 points): 0 = elimination time greater than three minutes, 5 = quickly eliminated within three minutes. Degree of medium damage (0 - 5 points): 0 = completely undamaged, 5 = severely damaged structure.

[0014] (1)Saturated sodium carbonate solution (2)Saturated sodium bicarbonate solution (3)Saturated sodium carbonate solution and 2% ethylenediaminetetraacetic acid (EDTA) (4)Saturated sodium bicarbonate solution and 2% ethylenediaminetetraacetic acid (EDTA) (5)Saturated sodium carbonate solution and 2% dimethyl sulfoxide (6)Saturated sodium bicarbonate solution and 2% dimethyl sulfoxide (7)Saturated sodium carbonate solution, 2% ethylenediaminetetraacetic acid (EDTA), and 2% dimethyl sulfoxide (8)Saturated sodium bicarbonate solution, 2% ethylenediaminetetraacetic acid (EDTA), and 2% dimethyl sulfoxide Conclusion of Experiment 1: In the experiment, sodium carbonate reacted faster than sodium bicarbonate. However, after the sodium carbonate solution was removed, crystals were likely to remain, and it caused significant damage to the paper surface. Moreover, its pH value was 12, showing strong alkalinity, which was likely to affect human health and cause environmental pollution. On the other hand, the reaction rate of the sodium bicarbonate solution was slower, but its pH was 8, showing weak alkalinity, making it safer and milder. After adding ethylenediaminetetraacetic acid (EDTA), the yellowing problem in the removed part of the reagent without addition was significantly reduced compared to the comparison. However, its content should not exceed 2%, as excessive addition would neutralize the alkalinity of the reagent and instead affect the reaction time of the reagent. Dimethyl sulfoxide would promote the absorption of the reagent and the substance, indirectly accelerating the reaction time, but its content was also controlled at 2% to avoid health effects caused by long-term contact with the human body.

[0015] Experiment 2: Based on the conclusion of Experiment 1, in order to improve the reaction time and removal degree of the saturated sodium bicarbonate solution while ensuring that the pH value is within a safe range. Therefore, Experiment 2 was conducted. The basic reagents for the experiment were: 100 mL of saturated sodium bicarbonate solution, 2% ethylenediaminetetraacetic acid (EDTA), and 2% dimethyl sulfoxide. The removal effects, time, and changes in pH value after adding different volumes of saturated sodium carbonate solution were compared (taking sketch paper, silk, cotton cloth, and rice paper as a group as an example). The results are as follows: Scoring criteria: Degree of color removal (0 - 5 points): 0 = no change, 5 = color completely removed. Removal speed (0 - 5 points): 0 = removal time greater than three minutes, 5 = quickly removed within three minutes. Degree of medium damage (0 - 5 points): 0 = completely undamaged, 5 = severe structural damage. For the latter group to ensure the accuracy of the experiment, the addition was adjusted to 2 mL each time. Conclusion of Experiment 2: Through Experiment 2, by continuously adding saturated sodium carbonate solution to improve the reaction time of the sodium bicarbonate solution, 2% ethylenediaminetetraacetic acid (EDTA), and 2% dimethyl sulfoxide, the reaction time was successfully increased to three minutes, and most of the reactions could be eliminated. By evenly applying, the cyanotype removal solution could evenly and mildly remove cyanotype imaging, with significantly reduced crystallization and residues, and less yellowing. Moreover, its pH value was controlled at 8.8, showing weak alkalinity, making it safer and milder. Attached Figure 9 。

[0016] Advantages: (1)Gentle and non-destructive: Appropriate use of strong alkalis or strong oxidants to reduce damage to paper and fabrics.

[0017] (2)Precise control: The degree of image removal can be adjusted by concentration and action time.

[0018] (3)Environmental protection and safety: Low toxicity and low pollution, can be applied to restoration and artistic creation.

[0019] (4)Wide range of applications: Can be used for various materials such as sketch paper, silk, cotton cloth, and rice paper.

[0020] Description of the drawings: Figure 1 Sodium carbonate saturated solution for comparing the elimination effects of different materials Figure 2 Sodium bicarbonate saturated solution for comparing the elimination effects of different materials Figure 3 Sodium carbonate saturated solution and 2% ethylenediaminetetraacetic acid (EDTA) for comparing the elimination effects of different materials Figure 4 Sodium bicarbonate saturated solution and 2% ethylenediaminetetraacetic acid (EDTA) for comparing the elimination effects of different materials Figure 5 Sodium carbonate saturated solution and 2% dimethyl sulfoxide for comparing the elimination effects of different materials Figure 6 Sodium bicarbonate saturated solution and 2% dimethyl sulfoxide for comparing the elimination effects of different materials Figure 7 Sodium carbonate saturated solution, 2% ethylenediaminetetraacetic acid (EDTA), and 2% dimethyl sulfoxide for comparing the elimination effects of different materials Figure 8 Sodium bicarbonate saturated solution, 2% ethylenediaminetetraacetic acid (EDTA), and 2% dimethyl sulfoxide for comparing the elimination effects of different materials Figure 9 Blueprint removal solution for the elimination effects on different media at different times (taking sketch paper, silk, cotton cloth, and rice paper as examples) Figure 10 Blueprint removal solution for the overall and partial elimination effects on the image on cotton cloth.

[0021] Figure 11 Blueprint removal solution for the overall and partial elimination effects on the image on sketch paper.

[0022] Figure 12 Blueprint removal solution for the overall and partial elimination effects on the image on silk.

[0023] Figure 13 Blueprint removal solution for the overall and partial elimination effects on the image on rice paper. Detailed implementation methods

[0024] Preparation: (1)First, take 9.6 g of sodium bicarbonate and 100 g of distilled water, and stir well for 10 minutes at 20 °C to prepare a sodium bicarbonate saturated solution.

[0025] (2) Then add 2 g of ethylenediaminetetraacetic acid, stir for 5 minutes, and wait for it to dissolve completely; (3) Add 2 mL of dimethyl sulfoxide, continue stirring for 5 minutes, and wait for it to dissolve completely; (3) Add 41 mL of saturated sodium carbonate solution (Preparation of saturated sodium carbonate solution: At a temperature of 25 °C, add 21.5 g of sodium carbonate to 100 mL of distilled water and stir for 5 minutes). After mixing evenly, a blue print removal solution is made.

[0026] Image removal: (1) Overall removal: Immerse the blue print imaging work in the reagent solution for 5 - 15 minutes, and stir or gently brush to accelerate the removal.

[0027] (2) Local adjustment: Use a brush or spray to apply the blue print removal solution to the target area, let it stand for 5 - 15 minutes, and then wipe it with a damp cloth.

[0028] (3) Image fading: Reduce the concentration of the blue print removal solution (add 50% water for dilution), and process for a short time to weaken the blue depth.

[0029] Cleaning and fixing: For overall removal and global image fading, after applying the blue print removal solution to remove the blue print image, rinse it with clean water 1 - 3 times, and dry it or flatten it to avoid excessive residue of the blue print removal solution.

Claims

1. A blue printing process removing liquid, characterized in that: It is composed of the following components in percentage by mass: 43.2% saturated sodium carbonate solution, 2% dimethyl sulfoxide, 2% disodium ethylenediaminetetraacetate (EDTA-2Na), and the remainder is saturated sodium bicarbonate solution.

2. The blue printing process removing liquid according to claim 1, characterized in that: The mass percentage of the dimethyl sulfoxide (DMSO) is preferably 2%.

3. The blue printing process removing liquid according to claims 1 and 2, characterized in that: The total amount of the auxiliary reducing agent disodium ethylenediaminetetraacetate (EDTA-2Na) added is 2% of the total mass of the cyanotype erasing solution.

4. The blue-printing process removing liquid according to any one of claims 1 to 3, characterized in that: The total amount of the sodium carbonate saturated solution added is 43.2% of the total mass of the cyanotype erasing solution.

5. A method for removing a cyanotype image, characterized in that: The following steps are involved: (1) The cyanotype process removing liquid described in any one of claims 1 to 5 is evenly coated or soaked on the surface of the cyanotype image carrier; (2) reacting at 0-30°C for 3-30 minutes; (3) Use water to remove residual reagents; (4) Drying treatment.

6. The method according to claim 5, characterized in that The cyanotype image carrier includes paper, textile, silk or synthetic material.

7. A method for local adjustment of a cyanotype image, characterized in that: The cyanotype process removing liquid according to any one of claims 1 to 5 is used to selectively remove or lighten a specific part of the cyanotype image by controlling the contact time and action area of ​​the reagent.

8. Use of the cyanotype removing liquid according to any one of claims 1 to 5 in image restoration, artistic creation or printing plate making adjustment.

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