OK I think I have this somewhat figured out but I'm really not sure. I'm wondering about an ID on the very light colored baby but the others as well.
I bred what I was told was a merle, and she does have some dark spots that are harder to catch in a picture as well as the babies having clearly different types of coats, to my male blue berkshire.
Mom:
Dad, he is a light blue more like the baby in question but not as light by a fair amount:
The babies were 4 dark mottled fur, 4 dark blue, 1 black, and 1 very light mottled blue.
Here are the 4 that look like mom and the 1 I am wondering about
Here are 3 of the 4 types (black one moved to another mom... but it is clearly black...)
Top to bottom, Dark blue regular fur, baby in question light blue, dark blue mottled like mom:
Baby in question, she has more dark patches but the flash torched them... the closed eye shot shows better:
So what I THINK is the case here, and looking for confirmation:
My female is a russian blue (self?) merle het american blue het dumbo
My male is an american blue het russian blue dumbo berkshire
Babies are 4 merle russian blue, 1 merle american blue, 1 miss (black), and 4 russian blue...
Any bold rat aficionados care to confirm or deny?!