Originally Posted by
QuiltingPandaBear
Do you all always pre-treat red fabrics with these products, or only those that are evidencing bleeding? And how do you know they are bleeding? I pre wash fabric before sewing but I segregate fabrics, so I’m not sure I would know if it was bleeding. I have just been assuming a hot wash has gotten the worst of the initial bleed out and moved on to sewing.
You can use a color catcher (sold in the laundry aisle at the grocery store) when you prewash the fabric. If the catcher has color on it when it comes out of the wash, it has absorbed dye from the fabric. Especially with reds, I wash them repeatedly, using a fresh color catcher each time, til the color catchers is barely pink.