oy! I'll jump in here....Our first litter of labradoodles had some of the "silvering" puppies in it so I started watching for it a while ago. And we have a "blue" poodle so I've had occasion to learn about that a bit....altho ANY of the participating breeders could add in here too, since at least 3 of them have silver, blue or black/silver doodles. 
There are the basic color genes and then there is a "d" or DILUTE gene that turns the black color gray, with the presence of a lot of white hairs, or there is the true silver color in poodles as well. That same dilute gene's presence will turn a brown, or chocolate dog to the cafe aulait, or silver-beige color as well.
Here, we have a black (f1) doodle that has a lot of long white fringy hair in her face and on her back, but I would really describe her as "salt and pepper" in layman's terms. She came from a blue poodle, so obviously she carries that dilute gene. We have a blue poodle who is truly a slate-gray color because of the evenness of the white in her coat. And we have a black poodle with a relatively few random white hairs in her coat. Poodle people seem to be more careful or specific about the description of their dog's coloring than doodle people, and of course AKC wants a color given at registration. And that's the tricky part, because the black poodle puppies that are going to turn "blue" don't typically really get there until adulthood, long after registration has been filed. My blue poodle, for example was registered as black, but she is not black.
Maybe I should have just said YES to your question :wink: but if your puppy was going to be a true silver I think you would've seen the color changing before 7mos, yet "silvering" is certainly descriptive and helpful when a black dog seems to be shifting in his color. I have silver and gray puppies in my gallery I believe, if you want examples. I'm sorry I don't know how to post them right here inside this post.
I hope this helps if you haven't glazed over by now! :shock:
There are the basic color genes and then there is a "d" or DILUTE gene that turns the black color gray, with the presence of a lot of white hairs, or there is the true silver color in poodles as well. That same dilute gene's presence will turn a brown, or chocolate dog to the cafe aulait, or silver-beige color as well.
Here, we have a black (f1) doodle that has a lot of long white fringy hair in her face and on her back, but I would really describe her as "salt and pepper" in layman's terms. She came from a blue poodle, so obviously she carries that dilute gene. We have a blue poodle who is truly a slate-gray color because of the evenness of the white in her coat. And we have a black poodle with a relatively few random white hairs in her coat. Poodle people seem to be more careful or specific about the description of their dog's coloring than doodle people, and of course AKC wants a color given at registration. And that's the tricky part, because the black poodle puppies that are going to turn "blue" don't typically really get there until adulthood, long after registration has been filed. My blue poodle, for example was registered as black, but she is not black.
Maybe I should have just said YES to your question :wink: but if your puppy was going to be a true silver I think you would've seen the color changing before 7mos, yet "silvering" is certainly descriptive and helpful when a black dog seems to be shifting in his color. I have silver and gray puppies in my gallery I believe, if you want examples. I'm sorry I don't know how to post them right here inside this post.
I hope this helps if you haven't glazed over by now! :shock: