What make a rat Russian :)?

Im getting to know the different kinds, coats etc etc, what the difference between for example a blue rex dumbo and a russian blue rex dumbo...
Thanks
How much r dwarf gerbils?
Answers:    The Russian blue is simply a color in rats. Here's an example: http://varieties.evergreenrattery.com/ru...

There are many different coat colors, coat types, body types, and markings surrounded by rats. For a basic overview, go here: http://varieties.evergreenrattery.com/in...

For a more complex overview, go here: http://www.hawthorn.org.uk/varieties.asp
How is sexing done within rats?
It probably refers hindmost to the "Russian Blue" -- a cat, known for it's pretty greyish blue fur.
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