FYI
Someone on this board mentioned a new marker on the market.
I found it at "Walgreen's". It's called FRIXION made by pilot.
There are 2 in the package.
The marks disappear with friction or an iron.
I am using it on the quilt I am making, called "Essentially Irish"
by Fons & Porter.
Good luck! (((HUGS))) Auntobby