"Almost every quilter who does not wash her fabric before cutting and sewing will have a story to tell about fabrics bleeding, dyes migrating to other fabrics, and uneven shrinkage. There is always unpredictable fabric to deal with".
On my small projects table runners and such I don't wash and have had no problems, but this is a king size quilt. 120"x120". So, I don't want to invest all the time and effort into it and have problems later.....
I have decided to wash.
I know this is going to take up a lot of extra time because the fabric will lose its sizing. I don't like working with limp fabric so I will use a little spray starch after I wash. I am in no hurry really so what the heck.
(so no strings will form along the cut edge of the fabric. That's what the directions say so I am hoping that is correct.).
Pre-test dark fabrics in a small basin of water for bleeding. If bleeding you can use salt or vinegar in the rinse water to set the color). Wash in gentle cycle and cool water. Wash separate from light fabrics. That's a no brainer, lol. If small pieces like fat quarters then wash by hand.
It's a start...