Because batiks have a high thread count, there is very little raveling in the dryer. I pretreat batiks with Retayne to set the dye. I get Retayne at the quilt store. I think they also carry Synthrapol. I have never used Synthrapol to set the dye. Here is what is says on the bottle:
"Synthrapol is an industrial strength, neutral liquid detergent used as a prewash, afterwash or wetting agent for paint and dye. Synthrapol has a unique characteristic of keeping loose dye particles in suspension, thus preventing backstaining."
Judy