METHOD FOR PRODUCING INK, PRINTING METHOD
PROBLEM TO BE SOLVED: To solve such problems that originally, distinct and clear printing is impossible with conventional natural coloring matter-containing ink because concentration of natural coloring matter contained therein is dilute, although the conventional ink has a color fading effect, and...
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Format: | Patent |
Sprache: | eng |
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Zusammenfassung: | PROBLEM TO BE SOLVED: To solve such problems that originally, distinct and clear printing is impossible with conventional natural coloring matter-containing ink because concentration of natural coloring matter contained therein is dilute, although the conventional ink has a color fading effect, and moreover there has been no viewpoint about control of the color fading time of natural coloring matter in the conventional technique.SOLUTION: A method for producing ink containing natural coloring matter of high concentration, which is based on addition of a polyoxyethylene sorbitan fatty acid ester etc., to the natural coloring matter and a solvent therefor, is proposed. In addition, a printing method in which speed of color fading of the natural coloring matter is controlled by adding an oxidation accelerator to the ink produced with the production method at the time of printing, etc., is proposed. |
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