CPC C09D 11/17 (2013.01) [C09D 11/02 (2013.01); C09D 11/16 (2013.01)] | 19 Claims |
1. A process for preparing in situ an aqueous gel ink with variable color comprising the following steps:
(i) preparing a gel-based matrix of aqueous ink comprising a reducing agent,
(ii) adding a solution of metallic salts,
(iii) adding iron powder to obtain an aqueous gel ink with variable color,
wherein the steps (ii) and (iii) can be interchanged.
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