I attempted to immersion dye two 100% rayon dresses. I bought them from the store a mustard yellow and want them to both be Black. I use pro chemicals' Deep Black. They rayon did not pick up the color. I tripled the amount of dye that I normally use for Black which is a higher dose than recommended by the company because I found that it needs more to get a deeper hue. Anyways I also dropped some cotton fabric and it colored beautifully Dark.
I don't know if I need to treat the rayon fabric differently before the immersion process.
Please help!! NOw I have two nasty gray dresses, but I'd like to finish the job properly.
Do you think I should use the Washfast dyes with boiling water to activate the color????