Marilyn,
There are products out there which will "set" the dyes in your fabric. In the past year or so, I completed a log cabin quilt top (a very large one) and I treated every one of the reds. Reds are notorious for bleeding, but I treated and then tested the fabrics after the treatment -- no bleeding. As a relative newbie, I'm thankful to have discovered what I used -- now my color choices won't be governed by the possibilities of bleeding fabric. I won't name the product I used here -- because it could be construed as promoting a product on the forum, and I won't do that!
By the way, I definitely prewash everything that comes in this house. I have adult onset asthma, and I just won't risk working with unwashed fabrics.
Last edited by Jeanette Frantz; 08-20-2017 at 11:51 PM.
Reason: additional content