"Some" indication of the amount of silver your kitten will exhibit can be (sort-of) "determined" at birth. This is noted by the amount of silver on the face. The more silver on face, the lighter he/she should be as a mature cat. The darker the face, the darker your cat should be at maturity.
The photos below are all the same kitten (black/silver). The silver really shows through and we see the STRIKING & AMAZING Black/silver!
In a RED SILVER please note how the color will get lighter as the undercoat begins to grow.
Thanks Bobby for letting me post the photos of this GORGEOUS boy!
Both of these parents are black silver. I am amazed at the variety of colors they produce! But, almost all of their kittens will have silver.
Here is a snap shot from our black SMOKE. Very nicely shows 2 tone hairs. The pigment is only on the tips and the underside has no pigment!