I have never belived much in the words.... My snake only eats white or dark rodents, but I have a lesser that only eats a rat with dark spots on it. Ive kept a record of his feeding by color. He has never talken a all white rodent. and will go weeks with out eating when given a white rodent, but put in one with some color and he's all over it. So what dose he see, because he not going by scent.
He dosen't care if it fresh kill, frozen or live if its has spots it gone, white no way.