Hello Gavin,
Probably impossible to ascertain from pics of your peurawot. More often than not, this is a sign of gilt construction (on copper or brass) with copper leaching out through imperfections/wear. Maybe you can find any hints under magnification?
The spear looks very much like having gilt bands. In this case the gold seems to be very thin and may have been applied from very thin sheet gold.
Regards,
Kai
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