I have an antique thermometer - from Appleton and Bassett-Boston. Came with our house. It has a frosted glass front with etched numbers and hash marks. I imagine that at one time the numbers and lines were painted black. I’d like to return it to this condition, but wondering how best to do it. What materials would you use to paint the numbers but not get paint all over the frosted part?
Asking here because it would be similar to painting a laser etched piece of glass.