@sharol I just use the dental bands in neon colors for marking my chicks if I need to keep some straight. It's just temporary so they don't stay on that long & I always make sure they're taken off if the chicks go to their new homes or in my case if they outgrow the brooder & go outside. I guess you could try the blu kote but I don't know how long it would stay on. If you try it let us know how it works.