Just because something has been out on the market for a while, and I've heard a couple people say nice things about it, I'm not comfortable using it on someone elses quilt til I've made a test on it's stated erasability. ( I'll cut to the chase and say it works.) I am looking to draw/quilt straight lines that run from light fabric to dark. My Sewline white chalk pencil works great on dark... I plan to use the Frixion Erasable Gel Pin on the light.