Babies have brightest colours, and are usually bright orange. Pictured above is also a normal winter white sibling.
Bigger babies, approx 18-25days
These bigger babies no longer the strong orange colouration as babies, and some of them may even have some dark spots appearing. The hamster above has a slight dark spot at the back ,which turn black later on, eventually covering the much of the back, however the black patch will even around the next stage. Very sorry no pictures of this stage were taken yet.
The hamster is now no longer pure orange anymore. There is some black tickling(a few black hairs here and there). Above is a picture with a young male, and the second picture is with an older hamster which has finished the colour changed in the middle of 3 other younger hamsters.
New Photos, 21/1/11 of a pudding.
After, at 3months Old. Note that the black part has even out, to a lighter colour.
There are other puddings who have retained a much better colouration, like the one below.