way to be wrong . . . When I say the three phases are compatible they are - Purple, white, and Lavander. You can breed a Lav x lav and you get all three phases, you can breed lax x purple and get lav and purple, lav x white and you get lav and whites, white x white all white, purple x purple all purple and purple x white = all lavs.
You can not breed Amel x Purple and get anything other than double hets, Amel being type II, and then a third type III that bob clark proved to again be distinct is not compatible with any of the rest. So recap there are 3 types of albino retics, of the type I there are 3 phases that are compatible with eachother showing different results. Each type is at a different Loci (or loucs) for each allele.
I did not go into any depth to the reply because it was not warranted. But since you want to again show your whit, allow me to clarify your own statements.