I found out that there are two variations in the material they used to made these crosses. Some are in fire-gilt bronze and some, like Claudios and Richards seem to be, are made of goldbronze. The one posted by Dave looks like fire-gilt.
I think there is a description of fire-gilding somewere in the forum or in the Construction Methods corner.
Goldbronze is an alloy of copper, tin and zink with a high copper content. But not as high as tombac.
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