Living Ink
An ink that lets you create drawings which disappear after you create them, then reappear over the course of several days. The secret sauce? Writing with algae. Full kits include two pens that reveal at different speeds. The Artist Edition include paintable inks and brushes.
Crowdfunded projects pose a degree of risk for buyers, so be sure to do your research and fully read the seller's detailed description and production plans before plunking down your hard-earned money.
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