You stated it is a kit, I'd be careful in washing first in case of shrinkage. You may not have enough of each piece when washed first. I would starch it make it and then wash with a color catcher or two, depending on the size of quilt. Shout makes one and can find it near the detergents in most stores. also there is a cloth called Dye Grabber and I have gotten those at Hancock Fabrics. Both do a good job.
Good Luck
Suzy