The rain is between Joplin and Pittsburgh right now.I don't know what they use. I do have a Word document with marking techniques for wildlife.
I think paint or dye would be best. I use colored zip ties for chicks.
http://www.google.com/url?sa=t&rct=...09.doc&usg=AFQjCNEqpUl0ITkVwN22huXlH6mDvEB5LA
I haven't been around in a while. Just too busy.
I think you set eggs the same day I did. Mine are due in 6 days and 7 hours. That is, if any survived the temp spikes and lows.
Microsoft forced windows 10 on me and that tied up the computer for a day.
I discovered chalkbrood (a fungus that kills larvae) in 2 of my hives so I'm dealing with that and it's supposed to rain for the next 6 days.
I'm also trying to use up all my mushroom plug spawn before the rain hits. Reishi, Maitake, Lion's Mane, Oyster and Shitake.
I hope you get it all and your hives do well.