There is no such thing as platinum in mouse varieties. Making up new terms doesn't help, it further dilutes the situation and confuses people.
Silver is very different from cream, champagne and PEW. Just because it is a pale silver, it is not a different, made up, variety. If you're not sure if a mouse is silver, look at the base coat, which will be blue or on a very pale animal, pale blue. You will be able to see the difference. And if you can't see the differenced between a PEW and a silver, you should consider geting your eyes tested! They are different colours.
Silver is very different from cream, champagne and PEW. Just because it is a pale silver, it is not a different, made up, variety. If you're not sure if a mouse is silver, look at the base coat, which will be blue or on a very pale animal, pale blue. You will be able to see the difference. And if you can't see the differenced between a PEW and a silver, you should consider geting your eyes tested! They are different colours.