What would be a safe way to mark chicks, here is my dilemma....I am a hatchaholic, and I usually pick out a few chicks to keep, then I sell the rest,I have had my working hours changed and now work evenings (2pm to midnight) most people that want to buy chicks stop in the evenings,hubby has a couple times sold the chicks that I wanted.....figured I could somehow mark chicks but not sure with what....has to be obvious, he is not real observant.........