This is basically a hypomelanistic Miami phase. An idea that was rather late blooming, considering how long Miami Phase and hypomelanistics have been around. Perhaps it was the unfortunate circumstance that most of the Hypomelanistics available back in the late 80s were mostly deeply orange colored and it would have been a step backwards to infuse all that orange into corns that were selected specifically for the LACK of orange coloration in the background. But I decided to bite the bullet anyway, and surprisingly enough, the early results were very promising.
To get a good idea of what we are dealing with here, just take your typical Miami phase corn, which is attractive in it's own right, and make all of the colors about twice as bright, and you have an idea of what the Crimson looks like. Of course, it helps if you've been doing selective breeding with the Miami phase corns for over 20 years. The name 'Crimson' originated from the brilliant red coloration that the dorsal blotches can have in many of the babies. Of course, there can be some substantial changes taking place as the animals mature, but you still usually get quite an attractive looking snake as an adult.