It depends on the age of the silver, if it is more than 4 years old it will be dull.
Shiny
dull
It is in fact the best radiator. Dull black is the best absorber and emitter. Then shiny black, followed by white, then silver. While the best reflector goes the other way around (silver's the best, then white, followed by shiny black, then dull black)
dull
dull
dull
dull
It is shiny.
Shiny
Shiny
shiny
Shiny.