I am selling my Silkie chicks locally and I would like to keep some of the chicks for myself if they are Splash and Lavender. Is it fairly easy to tell them apart from Blue, White? I have BBS and whites in my pen now with a chance of some of them carrying the lavender gene. If not at hatch, how long after would I be able to tell for sure? There not due til the first week of April. Thanks!