Photoacid-manganese photoresponse compound solution for inkless printing and application of photoacid-manganese photoresponse compound solution

The invention discloses a photoacid-manganese photoresponse compound solution for inkless printing and application of the photoacid-manganese photoresponse compound solution. The photoacid-manganese photoresponse compound solution contains merocyanine type photoacid and Mn < 2 + >, and the structural formula of the merocyanine type photoacid is # imgabs0 #. The method comprises the following steps: mixing a merocyanine photoacid aqueous solution and an aqueous solution containing Mn < 2 + > at room temperature under a dark condition, and then standing for reaction to obtain a solution, namely a photoacid-manganese photoresponse compound solution. And treating the filter paper by using a PEG-PPG-PEG solution and a photoacid-manganese photoresponse compound solution in sequence, and drying in a dark place to obtain the repeated writing paper. According to the invention, sulfonic acid merocyanine (photoacid) and an aqueous solution of MnCl2 are mixed under a dark condition to prepare a photoacid-manganese compou