I have 2 HQ bantam Brahma chicks that I purchased from a local feed store. I actually ordered 45 mixed bantams (all purebred) so I wouldn't get dead/sick chicks coming to my house. There are 2 buff Colombians and 2 I can't tell whether they are dark or partridge. How do you tell? I don't keep Brahmas and plan to sell them at a farm swap Sat. I would like to be able to tell a buyer what color they are. TY!