4 ms·uhh.. or maybe just chemistry? you can fill the tank with urine if you want but YMMV.by waynesonfire 4y agouhh.. or maybe just chemistry? you can fill the tank with urine if you want but YMMV.bregma 4y agoThat's fine for the magenta but what about the cyan, yellow, and black?spdustin 4y agoYou might be eating too many beets ;)dublin 4y agoMethylene blue works both as a nootropic and a cyan urine ink source! (Dosing is often roughly "keep going until you pee blue all the time"...)