Well I finally crossed blue x blue after producing blues by doing het blue x het blue.




and



I dont know a lot about blues (these are american Ive been told) but the hets have all turned out much darker and grey, while the blue x blue have all been lighter and more silvery.

Im interested to see if blue x blue (newer lighter ones) will produce even lighter variations, but that will take a while as I have to outcross them several generations and then do this again. The blues I crossed to make all blue litters were already separated by many generations (thanks to being produced by hets)