My cousin was telling me she uses one of these each week in her laundry. She uses the same one for each load, and yet, though it's been used over & over , it still catches the excess color and protects the clothes from getting inadvertantly dyed. So I tried it. It does work. I had one in 2 loads before I put it in with my towels where I was washing some new t towels from the Dollar Tree - they have orange leaves on them , and sure enough , nothing else in the load got orange on it but the color catcher. Then I put it in a load of darks and it came out a dark grey color. So I wouldn't use these one per load because it would be too expensive, but one per week I can go for to keep dyes from the wash water off my clothes, and my colors nice and bright.