JPH0336672B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for reproducing a decolorized image formed on an image support and a material used therein.

[Prior art]

Conventionally, various techniques for erasing images written with ink have been known, and have been applied as erasable line markers and the like. This kind of ink erasing technology is interesting for children because it can erase an image once written, but it would be even more interesting if the erased image could be reproduced again. A color-reproduction system is obtained.

〔the purpose〕

The present invention was made from this point of view, and it is an object of the present invention to provide a novel image erasing and reproducing system.

〔composition〕

According to the present invention, an image is formed on an image support with an ink containing a phloxine dye or an eosin dye as a main component, and then the image is treated with an acid to decolor it, and then the decolorized image is treated with an alkali. A method for reproducing a decolorized image is provided, which is characterized by reproducing a decolorized image.

In the ink used in the present invention, the concentration of the phloxine dye or eosin dye used as an ink component in the ink is 0.1 to 15% by weight, usually about 0.2 to 10% by weight, which is sufficient. Conventional auxiliary components can be added to this ink, such as binder components such as carboxymethyl cellulose, starch, synthetic adhesives, etc. to enhance the adhesion of the dyes onto the image support, and drying of the ink. In order to prevent this, an anti-drying agent such as glycerin or polyethylene glycol can be added.

In the present invention, an image is formed on an image support using the ink. In this case, the image support may be one with a solid surface, such as paper,
Cloth, wooden boards, etc. are used. Further, the image in this case can be created by hand or by using a printing machine. Note that the term "image" as used in this specification is broadly interpreted to mean a character, a drawing line of a design, etc.

The image formed on the support in this way is
The color is erased by acid treatment. in this case,
Acid treatment uses organic acids such as citric acid and succinic acid,
Although an acidic aqueous solution containing an inorganic acid such as sulfuric acid is used, it is preferable to use an aqueous solution of sulfuric acid. Acid concentration in aqueous solution is 0.1-20% by weight, usually 0.3-10% by weight
is sufficient. This acid treatment decolorizes the dye image.

The image decolored as described above continues to be in its decolored state, but this decolored image can be reproduced by alkali treatment, if necessary. Alkaline processing is performed by bringing an alkaline substance into contact with the decolorized image.
In this case, the alkaline substance does not need to be a strong alkali such as alkali hydroxide, but a weak alkali such as alkali carbonate, alkaline higher fatty acid salt (soap), calcium hydroxide, magnesium hydroxide, etc. is sufficient. In addition, the alkaline substance used to reproduce the decolorized image can be used in the form of an aqueous solution or in the form of a solid mixed with fillers such as clay, silica, alumina, etc.
Furthermore, it can be used by impregnating paper, cloth, etc.

In the method of the present invention, after forming an image on an image support with an ink containing xanthene dye as a main component,
This is carried out using an image reproducing material consisting of a support having a decolorized image obtained by decolorizing the image by acid treatment, and an alkaline substance. Such materials are
It will be sold as a product, and the erased image will be reproduced by the user. A preferable material for reproducing a colorless image used in the practice of the present invention is a material for reproducing a colorless image in which a colorless image is formed on one part of a sheet of paper or cloth, and the other part is impregnated with an alkaline substance and supported. be. The decolorized image of such a material can be reproduced by adding water to it, rubbing it, and bringing an alkaline substance into contact with the decolorized image area.

〔effect〕

The present invention has the above-mentioned configuration, and can not only erase the color of the image formed on the support, but also reproduce the erased image as needed. be used advantageously as

〔Example〕

Next, the present invention will be explained in more detail with reference to Examples.

Example 1 A pink ink was prepared by adding and dissolving 1 g of phloxine in 100 ml of water. Separately, a decolorizing solution was prepared by adding 3 ml of concentrated sulfuric acid (95% by weight) to 100 ml of water. Furthermore, 5 g of sodium carbonate was added and dissolved in 100 ml of water to prepare a coloring solution.

Next, write the letters on the cotton cloth with the above ink,
Next, wipe the surface with decoloring liquid to erase the color of the letters. When a coloring liquid made from an aqueous sodium carbonate solution was applied over it, the letters written in pink ink changed color and were reproduced.

Example 2 Add 2 g of Phloxine to 100 ml of water and dissolve it.
Furthermore, 1 g of 0.5% by weight carboxymethyl cellulose aqueous solution was added to this to prepare a pink ink.
Separately, a decolorizing solution was prepared by adding 2 ml of concentrated sulfuric acid (95% by weight) to 100 ml of water. Letters were written on the nonwoven fabric using the pink ink described above, and then the letters were erased using an erasing liquid.

Next, a soap containing solid sodium stearate as the main ingredient was applied onto the ink, and when water was added and rubbed, the ink changed color and the letters were reproduced.

Example 3 A red ink was prepared by dissolving 2 g of eosin in 100 ml of water. Separately concentrated sulfuric acid (95% by weight) in 100ml of water
A decoloring solution was prepared by adding 1 ml. Also, more water
A coloring solution was prepared by dissolving 3g of sodium carbonate in 100ml.

Next, letters were written on the paper using the above ink, and then the letters were wiped with a color erasing liquid to erase the color. When an aqueous solution of sodium carbonate was applied over it, the letters written in red ink changed color and were reproduced.

Claims (1)

[Claims] 1 An image is formed on an image support with an ink containing phloxine dye or eosin dye as a main component, and then the image is treated with an acid to decolor it, and then the decolorized image is treated with an alkali to create a decolorized image. A method for reproducing a decolorized image, characterized by reproducing a colorless image.