i had some red fabric I was using for borders on a quilt. I tested it by cutting a scrap of it and placing it into a glass of hot tap water -- almost instantly the water turned pink. I then began looking for a product to "set" the dyes, but I had no luck finding anything at all locally. What I did find is from Rit Dye dye fixative (no, I don't own stock or have any financial interest of any kind in Rit Dye), but I found that the dye fixative, used according to the instructions immediately set the dye in the red, so there was no further problem with "bleeding". I use it on any vibrant color, like reds, oranges, blues, purple, etc. I would rather spend a little time using this product that I know works than risk a bleeding border or other fabric! That's why I ALWAYS prewash, and I ALWAYS set the dyes. As much work as we put into a quilt, I would rather be safe than sorry! LOL
Jeanette Frantz