Repeated usable exercising writing paper with handwriting disappeared naturally

Abstract

The present invention relates to a calligraphy-practising paper which can be repeatedly used, and the handwriting written on said calligraphy-practising paper can be naturally disappeared. Said calligraphy-practising paper is characterized by that the surface of general paper (for example xuan paper and white paper) is impregnated with a special colouring material, under the neutral or acidic condition, said colouring material is colorless, under the alkaline condition said colouring material can appear colour (for example phenolphthalein can appear red colour, and the thymolphthalein can appear blue colour). On the calligraphy-practising paper the handwriting written by alkaline ink can absorb CO2 and moisture in the air, the handwriting can be progressively disappeared in 1-7 days, so that said calligraphy-practising paper also can be reused.

Description

Technical field: [0001] The invention relates to a new type of cultural learning tool, which belongs to the field of cultural and educational supplies and daily chemical industry. It specifically refers to a special kind of paper on which you can practice writing with special ink, and the handwriting will disappear naturally in the air, so the paper can be used repeatedly. technical background: [0002] Existing papers that are used to practice writing, drafting, and drawing are discarded after use. Therefore, a large amount of paper is consumed, and papermaking needs to consume energy, wood, water, and will produce a large amount of waste water to pollute the environment, so it not only costs a lot of money, but also is not conducive to environmental protection. Saving paper has become an important aspect of building a conservation-oriented society. [0003] The invention is a reusable paper, on which special ink is used to write, and can practice writing, learning drawin...

AI Technical Summary

Problems solved by technology

Therefore, a lot of paper is consumed, and papermaking needs to consume energy, wood, water, and will produce a lot of waste