They have a bit of warning, but I've personally had great success on dark marking with the Ultimate Marking Pencil by Full Line Stencils, the creator of the Pounce Pad. I also love the pounce markings but have varying degrees of success when making my own designs/templates instead of the purchased screens.
https://fulllinestencil.com/products...marking-pencil
I have used the soap method too, back when my eyes were sharper.