Originally Posted by
zozee
If it were me, I'd soak it in a tub of vinegar, water, and mild laundry detergent. Why? Because my LQS owner gave me the Amish "recipe" for homemade "color catcher" solution . It's those three ingredients. I'm not sure what proportions for such a large quilt, but supposedly the vinegar that sets color. I don't understand the science, but the solution works when I don't have storebought Color Catchers.
As has been pointed out here in other threads, the vinegar doesn't work to set synthetic colors anymore. It was used back in the day when most fabric dyes were vegetable or organic based.
However, soaking fabric in a tub of hot water and a drop of detergent is how I bleed my fabrics before I use them. I let them sit overnight, then rinse and dry.