Originally Posted by
snipforfun
Synthropol is for hand dyed fabrics and Retyne is for commercially dyed fabric. They both work well for their specific uses
Umm, no not really. Retayne is used to SET dyes be it hand dyed or commercial. Product description from Dharma Trading: Product Description
Use this product to 'fix' dyes in commercially purchased solid colored cotton fabrics or clothing to prevent color bleeding during washing.
Also use to add washfastness to your own dyeing. Particularly valuable to quilters.
Synthropol SUSPENDS excess dye in the wash water so it doesn't settle on the other fabrics. It makes no difference if it is commercial or hand dyed. Again from Dharma
http://www.dharmatrading.com/html/eng/2127-AA.shtml
Product Description
Synthrapol works best with HOT water, yes, HOT water, when washing out excess dye, particularly Fiber Reactive Dye. You are getting out the excess loose dye molecules that have not been chemically bonded to the fabric. This is a good thing! Then you can rest asssured that the dye won't bleed on you,