I don't know anything about the proprietary substances mentioned by
John Spradley, but it seems that dry lubricants have been pretty much
limited to the following:

  Graphite -- black, stains badly

  Molybdenum disulphide -- dark blue, stains badly (in a grease anyway);
the modern improvement on graphite (see modern piano parts); more
slippery, more durable.

  French chalk/talc -- doesn't form a coating, I guess.

  Teflon -- white, or may have colouring; Not suitable for such pressures
as G and M.

  Candle wax -- for wood/metal contacts.

If there are newer synthesised substances then your best source of info
is specialists in lubrication and the manufacturers.

By the way, what do Bechsteins use on the bridges in place of graphite?
Talc?

Robin P Clarke
Birmingham UK
http://www.zazz.org.uk/