I have this UV-reactive invisible ink (a clear liquid.) According to the data sheet, it is suspended in an isopropyl alcohol base. Unfortunately, this is terrible for my particular application for two reasons: (1) it dries too fast (I need it to stay wet on a rubber stamp for ~15 minutes before stamping.) (2) It is too "thin" and thus bleeds into the porous material a little too much.
I've used regular black ink refills that (I believe) are water-based and they are perfect (except for the visible, non-UV-reactive part.)
If I understand this stuff correctly, the UV ink would be UV-reactive particles suspended in isopropyl alcohol base. If I were to mix this with water to get a workable liquid, I would likely dilute the ink too much.
Is there a way to transfer the suspended particles from the isopropyl-alcohol to water? Perhaps by mixing them, letting them separate and then let the alcohol evaporate off the top?
Alternatively, to reduce dilution I've considered finding a clear viscous liquid (think simple syrup without the stickiness) or even a clear gel as a thickening agent. Unfortunately, I don't know of a good viscous liquid or gel that would evaporate without a visible/sticky residue. Possibly one of the inactive ingredients in a hand sanitizer gel?