I have one female that will not eat a rat that is mostly white, which is difficult because most of my lines tend to be high white. She slams colored rats, no matter the shade, so long as there is more color than white. A 50/50 animal is iffy.

I also have a female that will not touch anything but a live mouse. Not a scented rat, or ASF, not a F/T mouse/rat/ASF. It must be a live mouse. Gawd help you if you happen to decide to raise up ASF's in the mouse tank to scent them with mouse smell. It backfires and the mice become uneatable things tainted by the ASF smell and said picky snake refuses to eat until all traces of the vaguely popcorn-like ASF scent is gone. -_-