I am trying to dye a brown trenchcoat 60/40 cotton/polyester a dark royal blue color. I used hot water in a 5gal bucket about 1/2 full. Added cup of salt. 2/3rds of the liquid dye.
Can I just leave it in for a long time? Overnight?
The exact color is not really important, but after about 30 min, it looks like a light purple.