Thank you all so much for the tips on Retayne and Synthrapol.
I washed a deep green batik and thought that I would be ok. Then remembered my color catchers. Threw 2 color catchers in and rewashed....They turned a deep green. Added another 3 color catchers and washed again. They also turned a medium shade of green. Tried to remember all of the discussions on this board about Retayne...(never really paid attention because I never really needed to worry about a dark color.) Called my DSIL and she advised me about the Retayne and Synthrapol.
The Retayne set the color and on my 6th washing with a color catcher after the Retayne wash---the color catcher remained white. This fabric is going to be worn out by washing NOT wear!
From now on any deep color or RED will automatically get washed with Retayne BEFORE I do anything else!! LEARNED MY LESSON!
You might want to try Synthrapol now...