Message: I need to dye a dress from brown to black. The material in the dress is 75% acetate and 25% polyester. Can you tell me what dye to use and where to buy it? please. Thanks so much I would really appreciate your help as I am in a pickle with this

Both acetate and polyester need to be dyed with disperse dye. Don't try to dye it with Rit all-purpose dye, Dylon Dye, or any other dye that works on natural fibers.

Unfortunately, acetate and polyester must be boiled with the disperse dye. You cannot dye polyester or acetate at room temperature. This means that you will need a very large cooking pot to do your dyeing in, one which you do not plan to reuse for food.

You can mail-order disperse dye, plus the dye carrier you will need to use with it, from Aljo Mfg in New York or from PRO Chemical & Dye in Massachusetts, both in the US. The dye carrier is called Hi-Conc Polydeveloper by Aljo, and Dye Carrier NSC by ProChem. Without the dye carrier, you may find it difficult to obtain a dark color, such as black. I see from your email address that you are in Ireland; I do not know of a source in Ireland or the UK where you can buy the dye carrier, though I know you can mail-order disperse dyes from Fibrecrafts or KenTex Educational Supplies in the UK. You can also order iDye Poly, which is a type of disperse dye,  from Fibrecrafts and from other sellers of dyes and supplies made by Jacquard Products. 

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