Interesting, I met Peregrine (one of the rainworks founders) a few years ago at a meetup when he was starting to experiment with this. Really enjoyed his enthus

Interesting, I met Peregrine (one of the rainworks founders) a few years ago at a meetup when he was starting to experiment with this. Really enjoyed his enthusiasm for making art. From my memory he tested out a few different paints and found something that was supposedly biodegradeable - my best guess is he may be using one of the neverwet variants - http://www.neverwet.com/ http://www.neverwet.com/ , he mentions it here: https://twitter.com/icreatenovelty/status/445228159248506880 https://twitter.com/icreatenovelty/status/445228159248506880 edit: I'm wrong, he's using Belgium-based Nanex from the msds sheet.