The original Moscow's were half body Snakeskin. Ask breeders today what is a Moscow and they would explain a solid colour Blue,Green or Red. Looking for the colour to be cover well into the head.
The Green Moscow and the Blue Moscow are essentially the same, but the Green carries a lot of Yellow colour cells in the top layer and the Blue/Purple carries a red colour cell. Then there is a Red form which supports both Grey and Albino.
I refer to Phillip Shaddocks book which states.
The Moscow gene (or genes!) is highly Y-linked. What this means is that it is only passed on from father to son because it is located on the Y chromosome and the Y chromosome is only found in males. It has a sex determining region (SDR) that determines the sex of the fry. Genes physically located near the SDR never cross over to the X chromosome. So a female, which has two X chromosomes (the male has one) cannot ever be in possession of a gene in close promixity to the SDR. A female Moscow can never be genetically a Moscow and she cannot pass on the Y-linked color traits to her sons because she does not have a Y chromosome.
This should get you going.