Sarah also mentions a marker that I assume is a FrixZion thermo-sensitive gel pen. I’d like to add a few cautionary words that apply to all markers used on fabric. While I use them myself regularly, I like to follow my self-imposed “to test is best” rule. The ink in some markers can be set with heat, and some others come back to life when exposed to detergent. Most wash out and even disappearing markings require rinsing with clear water before laundering. I like to test all markers for removability and for wash ability on a scrap of fabric before using on a project.

