Step 3Screenprint
The scratch off ink is 5 parts water soluble block printing ink, the kind you can find at most craft stores, to one part dish detergent. The detergent prevents the ink from binding together into a cohesive layer. This means it will dry flat and professional looking but crumble to dust when scratched off. It looks best when laid over a smooth, shiny surface. Make sure to print it on glossy paper, as rough matte paper will make the ink stick somewhat and the scratch will be muddled and blurry.
I hung all the printed sheets to dry after screening. The detergent causes the ink to dry very slowly. I'd allow it 24 hours to set up if you have the chance. If you stack the sheets together before they're fully dry the scratch off layer will stick and transfer to the other sheets. Not fun.
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