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What is the best kind of fabric paint or markers to use that is permanent and doesn't fade?

I'm starting a business selling clothing that i make and decorate...what ink or pens or paint or markers or anything you know of can i use that wont fade? do you know what companies use to print stuff on shirts in stores?

Public Comments

1. SHAAAAAAAAAAAAARPIES!!!! The best! I used it to decorate a shirt and it never came off.
2. Sharpie makes permanent markers... and those suckers don't fade. I've gotten 'em on my clothes by accident, and the marks are STILL THERE!
3. acrylics are pretty good however i don't know if they fade easy
4. Crayola makes fabric crayons for quilting-Fab!
5. Computer color
6. Sharpies, but your pretty limited in color. In Art& Crafts Stores you can find all kinds of fabric paint. Some will strech with fabric, Wal-Mart usually has a good selection.
7. My Boyfriend made me a shirt with a sharpie and it did fade. It was black and now it's a dull grey. I keep wearing it less and less in fear that one day it'll be barely noticable.Thought you might want to know.