Ahhhhh I don't want to nit pick (but I'm going to) but I think your (and maybe everyone's) terminology for 'roan' merle isn't quite right. Roan refers (as far as I know) to a mixture of white and coloured hairs (usually white and gray). Here is a merle mouse: http://www.eastcoastmice.org/im8iz6%20copy.jpg
The gray mixed areas are the 'roan' areas.
Here is a chocolate roan mouse: http://www.eastcoastmice.org/25owfly%20copy.jpg
please inform me if I am wrong, but I don't think the ones you labled roan meet the criteria. I think technically (if my assumptions about 'merle' actually being splashed is correct) they would be TRICOLOUR RATS!
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