The Dominant Spot gene, Ds, produces patches of white over the head and body of the hamsters, as well as turning the belly fur white. The "coloured" patches
can be any colour, including Golden, Cinnamon, Yellow and, (particularly striking), Black. The amount of white varies considerably between individuals; some look like "white animals with coloured patches", while others resemble "coloured animals with white patches".
Since this gene is dominant, it need only be inherited from one parent. Since the belly fur is white on Dominant Spot animals, it is impossible to be sure whether or not they also possess the white bellied gene, (Wh), which, (if present in both parents), can produce eyeless pups. To safeguard against producing eyeless young, a Dominant Spot animal can be mated to a non-Dominant Spot animal of the appropriate colour, producing around half Dominant Spot and half non-Dominant Spot young in the litter. A further complication occurs because Dominant Spotting is a "Homozygous Lethal" gene; embryos inheriting a copy from both parents, (if two Dominant Spot animals are mated to each other), die in the womb. This means that all Dominant Spot animals are "carrying" the ds gene, for non-spotted coats.
Cream is a light colour so the dom spotting may not be obvious
I know it is hard all these genetics!