So I did a dye attempt yesterday using RIT dye. The white parts I did didn't turn black. They actually turned a smokey gray amd not a solid color either. I dyed them for about 1/2 hour each. Why did this happen? It's white going to black. How hard can that be? However for those interested, RIT dye will not completely dye windows. It will just cloud them a bit, which looks surprisingly cool.