Anerythristic (Carbon) Boa Constrictors
A Carbon boa is easy to spot by its eyes, which are solid black with no visible pupil. Adults hold their high-contrast look for years, with no yellowing or browning out past three years old.
Other Anerythristic strains
About the Anerythristic (Carbon) gene
The Carbon is a boa constrictor gene that removes yellow and red pigment and leaves the eyes solid black. It is one of several anerythristic lines in boas, and breeding trials show at least some of them sit at different loci. A keeper buying a Carbon is buying a line with a documented origin in one breeder's collection and a high-contrast look. It has been proven incompatible with Anerythristic (Type 1), so pairing the two gives no visual of either.
Appearance
A visual Carbon has completely black eyes, with no pupil visible against the iris. The snake is light in tone but heavy in contrast, with an underlying pastel effect that passes to offspring in a polygenic way. Adults hold that colour and contrast for years, with no yellowing or browning out past three years old.
Genetics
Because Anerythristic (Carbon) is recessive, a visual requires two copies and no super form exists. You can list a visual as Anerythristic (Carbon), a proven carrier as Het Anerythristic (Carbon), and a possible carrier as 66% Het Anerythristic (Carbon), 50% Het Anerythristic (Carbon) or Pos Het Anerythristic (Carbon).
The first Carbon was produced in a 2015 litter by Kenny Saito of Boaffliction, and the line was named Carbon in 2018. The hobby disputes whether Carbon is a separate discovery or the same gene as the Anerythristic (RDR Black Eye) line from Ralph Davis Reptiles under a different name. Boaffliction has rejected the claim that Carbon is just a line of RDR. It is sold as Carbon Snow and Carbon Ghost when combined with other genes.