pigma micron pensT
From this web site:
Sakuraofamerica.com
In the section about applications for pigma micron pens:
When referring to textile / quilting usage
"* Please note - the inks on fabrics are for " decorative purposes only" - meaning do not launder. Use on pre- laundered textile, 100% cotton. And most importantly, to pre-test on material scraps prior to final application."