http://shorinternational.com/TestGoldMakeSolution.htm
I couldn't find the first site I found some colors on, but they did agree on the ones found up above as well. But that also looks like they used some sort of aqua regia or had a dichromate salt present.
Now I need to bring a silver coin and some crappy silver trinkets into school and drop them in acid to get to the bottom of this or I won't be able to sleep all week
BRASS--Dark brown
COPPER--Brown
GOLD--None
NICKEL--Blue
LEAD--Yellow
TIN--Yellow
SILVER (PURE)--Bright red SILVER (.925)--Dark red
SILVER (.800)--Brown SILVER (.500)--Green
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