Here are some pics of a female boa I have in my collection that I would "term" a pastel she has a huge reduction in black, is very clean and really pink.
Pastels can be very variable in terms of pigment just as salmons can and I also personally beleive that this gene acts in a co - dominant manner similar to the salmon gene.
The father or his snake was a beautiful pink and very clean animal he was bred to the blackest, ugliest female boa I have ever laid eyes on. This breeding produced the snake below.
If this morph is a selectively bred trait you would produce young with coloration somewhere in between the parents. I viewed the whole litter of 23 babies and 11 were clearly extremely different in coloration (pastel) from the other 12 really dark like their mother. The female below was even brighter and pinker than her father.
I have a large group of these so called pastel boas and intend to try and work with them to figure out what is going on in terms of their genetics. Whether or not I am successful who knows but they are very beautiful boas.
You can see by the pics that she is missing almost all her black coloration.
This boa was born and bred in Canada and has nothing to do with Jeff Ronne's stock.
Just my 2 cents.
Dan