Seven village metal?

[Pusaka]

Well the answer as to why the pendok I have is not tarnishing must be that the alloy contains a metal which resists oxidation, I assumed it could be gold however it could also be nickel i.e. some type of nickel brass or bronze mix. My only reason for brining up the subject of Tibetan bowls is as Jean also stated they too resist tarnishing (the old ones) and as I have demonstrated this alloy is known at least in Bali.

All the subjects that have been raised are all on the subject of keris and metallurgy. I don’t mind the subject of unusual alloy keris blades being raised as I myself started this thread with similar statements that I had seen such a blade and buckle myself

As for Caster's keris, my belief still stands and yes it is fine to disagree with it.

[David]

Surely you can see that the color of these two metals are completely different and i know of no studies that would show that the surface pocking here is due to the inclusion of meteoric ore. The pocks on the thogchags is probably due to it also being a produce of casting. I have looked at dozens of thogchag objects on line that do not have these pock marks, so i am doubtful that they prove anything relevant to our conversation. But yes, it is also fine if you disagree with me.
The subject of metallurgy in this forum is just fine with me when it applies to keris, but when we start getting off on tangents debating whether gold adds to the sonic quality of a gamelan gong or Tibetan singing bowl then as moderator of this forum i am going to make the call of "off-topic" and try to pull the discussion back to the subject at hand. I am personally very doubtful that the sound quality of you pendok is a valid issue here.

[Pusaka]

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

[David]

Originally Posted by Pusaka

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.

Why should pitting be caused by the casting process. Because air bubbles get trapped in the mold and leave pits in the surface of the cast. This is a well know effect of the casting process.

Originally Posted by Pusaka

Meteorites are often dirty things and pitting is often the result. This pitting is often but not always observed in thogchag.

Of course meteorites are "dirty things". That is why you must refine the impurities out of them before you work with them. I have seen images of many blades forges with meteoric ore that have no pitting whatsoever.

Originally Posted by Pusaka

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

Adding meteorite to this keris would not be adding "impurities". You would simply be adding another purified metal to the process. I am afraid that your line of reasoning here is making little sense to me and i see little use to all this speculation based merely upon internet photographs in furthering any understanding of the make-up of this keris specifically or keris in general.
I suggest that if you want to continue finding an understanding of the materials used to create your pendok that you try having it tested for various metal contents. Certainly it can be tested for gold or silver content. It seems that it has some metal in it's make-up that resists tarnishing, but what that is exactly will remain a mystery until you take the steps to find out.

[Pusaka]

Sorry pitting due to air bubbles do not look like that, there are too many and too close togeather.