what color bunnies are these?

[Bunnylady]

I would argue that it is castor but not showable castor all most all colours are not showable if you start mixing them.

By this logic, Steel is just a dark Chestnut, or Orange just a poorly colored Red. Anyone who is trying to breed showable Castors will never, ever get there breeding Chestnuts, they need to know the difference.

 

[SpotTheCat]

By this logic, Steel is just a dark Chestnut, or Orange just a poorly colored Red. Anyone who is trying to breed showable Castors will never, ever get there breeding Chestnuts, they need to know the difference.

Steels is caused by the steel gene.
Yes they should know what is showable and isn’t but a pet quality Rex is still called a rex if you take a bad quality castor or as you call it a chestnut and keep the redder ones you can in years get showable castors.
I will not argue with you anymore.

 

[SpotTheCat]

As someone who has bred Mini Rex for more than 30 years, I can assure you, this won't work. Rufous may be considered a modifier, but it is a gene (or rather, a polygene), and if you haven't got the genes to make it happen, it won't. Granted, you might just luck out and buy an animal of another color that just happens to be carrying rufous modifiers hidden under some color that doesn't use them (like maybe Black or Chocolate), and, by selectively breeding its offspring together, arrive at a showable Castor, but unless the modifiers are in there somewhere, you can breed Chestnuts together until the cows come home, and never get to a Castor. Without the rufous, you won't have "redder ones" to breed together, all you'll have is Chestnuts.

That’s interesting and makes sense.
Thank you for that info it answers some things I did wonder about,
Then I agree castor is black agouti plus Rufus
that was not how it was explained to me unfortunately