Thanks to all who gave me plenty of ideas on making new screws appear
to be old.  One person, not on MMD, suggested that I wrap a couple of
the new screws in a paper towel soaked in vinegar, and another couple
of screws in a paper towel soaked in ammonia, and then place each
bundle in a jar with sealed lid and leave over night.

I did this and the bright shinny screws were a dull darker finish the
next morning.  The vinegar worked better than the ammonia.  Now that
I have dull silver screws I think I will try the bluing process and
see what happens.

Larry Wilson