Pearl Cage Winter White Hamster Is Not A Pearl White After All?

Winter white hamster is not a pearl white after all? - pearl cage

Here's a question for those who know a thing or two about "color" to "winter white dwarf hamsters:
Approx. 2 months ago, I fell in love with the little white man in a local pet store. So we brought him home with a little knowledge of their species. I know that bought in nature, wants to change the colors, but assume she is white and has since the day I must focus a pearl. It is a place in my room that receives little or no other light than artificial removed. The lighting is not changed at all.
Well, a few days ago I had the boy and found him a little bit dirty. He thought he had roles in his bowl. Then, 2 days ago I realized ... This is not dirty! It is gray in the face! He now has a gray mask around the eyes and forehead, and gray is a bright spot in the formation of his ass. It is always nice, but now I'm reconsidering this pearl white. (This is not sound. When I arrived, he was a perfectly normal and sapphire in the cage) I suppose it cana sapphire? His gray is too light to normal color.
What had caused this sudden change of color when? Could the dominant heat? I think it was in my room (the warmest room in the house are called), sleep and lie on the cold metal wheel.

Facts to consider ...
Dicey has grown, a man of about 4 months (which is a bit since my arrival, and it was about a month, at least when I was at the pet store)
"Do not let the natural light
Its color is normal, yet solid, white with gray ears and a gray band on the wide-eyed and black back
"The last week and a half was hot. Slide the three figures at the facts.
"We keep the house for 78 years and usually not much higher or lower