Well, I did this pairing a few months ago and the babies are finally here. The breeding pictures show my adult male long term captive black rat with my female leucistic black rat. The goals of this project are to outcross the leucistic line, turn the hets more solid black, and make a giant leucistic black rat down the road as my male is huge.
Here are the two clutches. The one with the normals is from the above parents and the one with the leucistics is from a het to het breeding. (Adults not pictured as I never caught them in the act).