Quote: The question asked was specifically NOT silver partridge, but just "silver." I am not aware of a self-silver bird; it would be white, and other than having silver instead of gold, would have a similar genotype to a self-buff (as compared with buff columbian).
All chickens have the s-gene; which alleles are present determine whether the bird has silver, gold or golden ground. Ground colour does not always show (black, blue, lavender, chocolate, etc.), but it is always genetically present.
Breeding a male with silver ground to a female with silver ground will give pure silver to all offspring. Whether the silver will show or not will depend on other genes. For example, blacks and blues can be leaky in the hackle, allowing ground colour to show. Patterned varieties such as partridge, wildtype, laced show ground colour.