I have some lightly marked silver kits this year and they are As solid as the others ,although the two silvers in the litter got eye infections before there eyes opend , the others never ,I have seen heavily marked silver kits young ones and they didn't seem as strong there bones seemed a lot thiner .but the light silver strain I have which gave come from a friends stock bar the eye infections seem solid to me , so is it possible with silvers the further away you breed them and the lighter they become the healthier the ferrret ,?????? So bews which to me seem silvers with no silver would be a