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WAYS TO REMOVE WRITTEN
Method one: removal of blue (violet, red, green) paste, ink, stamp mastic.
It is necessary to prepare a solution steam:
1. In distilled water (50 ml) at a temperature of 20–30 ° C , potassium permanganate (3–10 g) is added in small portions and stirred until the solution is full. After that, as if the solution was being saturated, the next portion of potassium permanganate was no longer dissolved, and glacial acetic acid (50 ml) was added. The solution during storage quickly loses its activity. Makes preparations immediately before use.
2. In distilled water (100 ml) at a temperature of 20-30 C add 1-2 tablets of hydroperit. Application: thin a cotton swab on a glass rod or a match with a lightweight touch put the solution number 1 on the removable spot, starting from the center. DO NOT LOSE . Through 10-15 seconds . Finish can be repeated. The stain from solution number 1 is discolored by solution number 2 .
Another way: removing black paste, ink, stamping mastic. The difference from the main recipe is that pre-cotton swab dipped in alcohol removes the main layer of black, but then also acts as if in the main recipe. When using the method on paper with a colored protective net or inscriptions of printing ink of all colors other than black, in some cases it is possible to change the color of the dyes. It is recommended to carry out preliminary tests in a small area.
The third way. Sodium sulfite or any other substance containing SO3 ion must be mixed with water. The gas emitted at the same time with a sharp undesirable odor gives the sheet its whiteness.