I am not referring to the colour of the two metals, obviously they will vary due to the ratios of copper to tin/zinc. I was referring to the pitting which is not caused by the casting process (why should it be) but due to the fact that there are impurities in the metal.
Meteorites are often dirty things and pitting is often the result. This pitting is often but not always observed in thogchag.
Now you have to ask yourself the question did the person who made that keris not have the skill to remove the impurities from that brass mix or did he add them deliberately, Personally I believe the latter
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