What's a blue rat?

Sky Blue Fancy Rat

This is a slate-blue rat similar in color to an Russian Blue cat. A random mutation found by chance in England c.1990 .
Some clubs now recognize a 'Russian Blue' color that is slightly different. One of the clubs calls very pale blue rats lavenders. But its a known fact that most clubs have trouble agreeing in what to call a color or the standards for colors they accept and even if the color is a new color or just a bad example of another color. Best to check with your own club leadership if you are not sure of what color your rat is. Sky blue is recognized as well and is a lighter shade of blue then a show quality blue. A pink-eyed pale blue would be considered a platinum.