Is it possible to tell purebred from mixed chicks?

[k19smith]

I may be completely wishful thinking here but for my first incubator experiment I have 24 eggs, the flock they came from was all Buff Orpington & Black Australorp purebred hens & roosters is there any chance to tell pure breed birds at any age? Sorry for the silly questions I'm new to this.

 

[cypressdrake]

If they were all together then chances are they may be mixed. That will take growing them a while to tell for sure. You should be able to tell sometime as chicks, but sometimes it takes a few months.
Say you have an equal amount of each, then it may be a 50/50 chance of mixed breeds.
Some roosters are aggressive and claim all the hens. As for telling, the buff's will be about 99-100% buffs if pure. The best way is to watch them grow out. The buffs should be buffs, and the blacks, black. You should be able to tell a mixed chicks almost at day old, but then again, sometimes it takes a few months.