Satin meeces were bred from animals that were subjected to radiation back in the 50's; I'm not sure who bred the satins to the state of being a stable tranmissable phenotype (phenotype=visible traits). Satin meeces are based on a recessive gene, meaning that both dam and sire must carry the trait. Since both your new beauties are satin, you will get al satin, and all long haired as well, since long hair is also recessive.
The blue doe is very, very nice looking. I'm envious as all get out. At the same time, I hope you got healthy individuals who aren't inbred. Satin meeces can suffer from a number of health problems including low fertility, problems with digesting food, and if the babies inherit too many harmful recessives, they can be very compromised health wise. I'd suggest crossing to a standard coat short hair first. Maybe you'll get lucky on this mating. I'll keep my fingers crossed for you and your mousies.
BTW, the reason the fur looks shiny is that the individual hairs are hollow, a trait satin meeces share with polar bears.