registering mini schnauzer puppies

Question
I have four black mini schnauzer puppies (5 weeks old).  Three of them have a small white spot on their chests, the fourth has a small white spot on his chest and a white spot on one hind foot.  Do I register them black or black & silver?  What exactly do I look for to determine whether they are black or black/silver?

Answer
They sound like blacks to me. BS puppies will have the same markings that SP dogs have, although in some cases, they may be darker, or not as clear as they will be when older. Here is one of my BS puppies at around 5-6 weeks of age (mine are quite dark when little): http://members.aol.com/britmorms/pup8.jpg