The fail- I know that my hands get stained whenever I use food coloring. So in an attempt to dye the etching I coated it with food coloring.
In theory it makes sense. in practice it didn’t work. (this was a practice glass I did before making the gift set a few years ago) I suppose it could have been because it wasn’t a fresh design but after using the darkest color I had and sitting over night I doubt this would work.
The find- I picked up 6 mugs at Dollar Tree, (like the taller one) and the other mug glass paint, and brushes at Walmart. (Just under $2 each for the mug and paint, $3 for the brushes)