I have used Pigma Micron pens for writing on the label information. The red, green, and brown have faded. A LOT! It's been about 2 years, and I can barely read some info. That quilt gets washed about once a month. I made a siggie pillow for a friend that gets washed frequently since her dog drags it to his end of the couch to use, and all the writing that was done in Sharpies has held up, while the ones with the Pigma pens have faded.