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Dilute copper sulphate solution makes a good invisible ink. If you heat things written with it it catalyses the charring of the paper and the "writing" turns black.I don't think you could easilly get the stuff dehydrated by heating it because it would char. You might manage with a dessicator."don't have an answer, but I am wondering how you intend to apply the ink without being able to see it "You could load it into a printer.