Is this a siamese

I have a male rat born in march that i held back with other males for more breeders. Since he was little before weaning he was solid white with red eyes. But lately in the month or so his nose is beginning to darken on the top. the the beige hooded rat in picture next to his is his brother.

any ideas.
http://i4.photobucket.com/albums/y14...S/100_2619.jpg
http://i4.photobucket.com/albums/y14...S/100_2620.jpg

I got this from this website.

http://www.80stoysale.com/ratbreeding.html

Siamese -Usually a off white to cream color with Dark shading around nose and behind area.

He is a Himalayan. You need to copies of this gene to produce a Siamese. :)

What she said! :D