I am making a quilt with Robert Kaufman fabrics. One of the colors is red. I always prewash. This red color is still bleeding even after FOUR washings. I have decided to go ahead and use it, but will always use a color catcher when I need to wash the completed quilt.

For that much of an investment why even ask? Pre-wash...it will be the end of the guessing game.

I don't prewash, but I do use the color catchers. If I have intense color I will put several in the wash with the quilt.

I do use the color catchers. If I have intense color I will put several in the wash with the quilt.
I absolutely love Kaffe's fabrics. I am using a quilt made with his woven stripes fabric in the Optic design. I did not prewash the fabric. I then used those woven stripes with batik stripes for a quilt. I did prewash the KF woven and that was a big mistake as it took out the sizing and what ever so that when the 1/4" seams were sewn there was no end of slippage, causing me great frustatration as a new quilter who fell in love with a pattern. I learned to spray starch! and not to prewash.

I almost always prewash. I don't do it until I've selected the fabric for a project. I like the ironing. It gives me an opportunity to review my selections and more times than not, I will swap out one of the fabrics. I have one exception to prewashing. If you are doing a Stack and Whack where you have to cut precisely in the same spot of the repeats, it is best not to wash. Also, if you are making a wall hanging, it is probably not necessary.

I cut off a corner & put it in water if I'm afraid it might bled.

I prewashed once, and never again. The fabric got so wrinkled and ironing was such a pain. Also, the edges were nasty. That said, I have used all sorts of colors, saturation, etc., and have never had a the colors run. As to washing the quilt, I wash in cold water using Tide. Nothing fancy. And I dry it in the dryer. I don't let the quilts sit in a laundry basket, though. That is tempting fate.

I stopped pre-washing, then washed a finished project and it ran, and am now pre-washing again. Insurance!

cut a strip wof or just a chunk, put in a cup/bowl of HOT water and watch it....if it's going to bleed it will do it in the cup of HOT water.....that's how I check for colorfast...so far so good

I rarely prewash and haven't had a problem.