Pretty cool...I thought it might be ink - BTW, I have an artist daughter in Detroit (6th year in art college) - she the one that showed me the ink before. Sounds like a very good method, especially since in your photos it looks like it comes off very clean with the pin. Clever clever of you...
Caleb, your eggs are beautiful! I have a question about the "etching" eggs you made - did you use wax? And what type of paint did you use? When I was growing up, my mother collected decorated eggs that were decorated with this sort of etching and wax method, so I'm curious about your...