"Todd Rich" wrote in message
...
Harold & Susan Vordos wrote:
(snip)
dictates what is used, and in what proportions. Yellow gold is
comprised
of silver and copper, generally with a trace of a sacrificial element to
keep the base metal from oxidizing, often times just zinc. White gold
has
no copper at all, but contains nickel instead. Green gold is
primarily
silver and gold. Blue comes from the addition of iron.

Harold

And if I remember right, aluminum gives you purple, but it is too brittle
to work and can only be cast.
Todd

Yeah, lots of other colors can be created beyond those we've mentioned, a
list of which I have in my possession, a leftover from my precious metal
refining days. As you stated, some colors are created at the expense of
loss of ductility. You can cast the alloy, but it can't be worked beyond
cleaning and polishing. Do you wonder how many people actually understand
why gold comes in different colors? My experience as a refiner was that
almost no one understands gold unless they work with it, and even then many
don't have a clue. It was a fun hobby, and then a great way to make a
living, but like any hobby that turns into a job, that's what it was in the
end, and it was a happy day when I sold by refining business and retired.
I'd had enough "fun" by then.

Harold