Hi there - I am new to the chicken world and recently purchased 6 birds for my backyard flock. I have 2 Hy-lines, an Australorp pullet about 4 months old, 2 Australorp hens about 12 months old, and an Australorp rooster who is 6 months old. All the Australorps are supposed to be pure bred and are from reputable local breeders. The pullet and the rooster are a lovely solid black colour with a green sheen and even the soft feathers around the top of their legs / undercarriage / fluffy backsides are solid black. However on my two hens I have some dark brown colour tint which is a dark chocolate brown - almost black but not quite. One hen has this colour in the odd feather on her back, while the other has it on her fluffy backside feathers on her undercarriage. You don't really notice it until you compare them with the rooster and other pullet. Both hens are unrelated and are from different breeders. They are currently molting a bit so I'm wondering if this brown tint is normal and will go, or whether its a colour fault. One of the Australorp hens went broody a week after I got her and she is currently sitting on 8 eggs due later this week - eggs are a mix of both Australorp hens. Any advice about this brown colour issue would be appreciated!