If you wanted to prove out the RS as guaranted then id pair to a Super Pastel. Pastel RSs are pretty easy to identify against single gene Pastels Vs RS.
Or simply another RS, the super is unique enough to not misidentify.
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I would say go for pretty much any recessive, that gives you the best odds of not introducing anything too crazy that might muddy the water. A simple Mojave RS sticks out like a sore thumb so you would know pretty quick.
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but then were back here again next season with half a clutch of white snakes that may or may not have RS 
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I belive t_h_wyman meant that I should use a male with no incomplete dom genes, so all babies would be Mojaves and some of them Mojave RS, which would be easy to ID 
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Oh damn, your right! That went over my head.
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Wow, I really like that Mojave red stripe!
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This is correct
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Here are nr 3 and nr 6 (darker head and neck).
Some of suggested that nr 6 doesnt have RS, but nr 3 might have. Still thinking the same or is it more obvious now? Thanks!!!
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Hello everybody! Long time no see. Just wanted to let you know that I got mom tested for RS (in RGI lab) and she is not, which means none of the babies is RS either 
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