A true Sandfire is a dragon produced at Sandfire Dragon Ranch, all others are red, gold, yellow etc phases that MAY have a Sandfire parent, grandparent or even father back. It is the same as a Drachiu, Dunne, Joel or Allen dragon, they are breeders of a line, not a phase or color morph. And each is unique for what they produce.
According to Steve Grenard, unlike other reptiles, bearded dragon color variations are influenced by variable sets of genes rather that a set of dominant or recessive genes. He states that according to breeders who have bred many generations of them, no matter how hard they try, breeders will always get clutches that are 50% or more standard colors and the balance the predicted color combinations.
From our experience, there are no true recessive genes in bearded dragons at this time, people are trying, but as far as we know at this time, it has not happened. One breeder produces stripe patterns each year from the parent dragons, yet none of the offspring produce any stripe offspring. Dragons are just difficult creatures and refuse to be placed in a set mold
But... we love them anyway!