Adrian wrote:
The Natural Philosopher gurgled happily, sounding
much like they were saying:

Ah, right. So, you're saying that all recycled copper wire in Japan was
of the utmost purity? What a load of cock.

No, I am saying its inconceivable that corrosive agents, rather than
mere traces of other metals,. would survive re-smelting.

You'd be wrong.

Back in the late '80s, Citroen had a lot of problems with the cylinder
blocks on diesel turbo CXs going porous, between the combustion chambers
& water jacket. Turned out to be poor quality recycled scrap being used
by the foundry in India - which was also used by M-B and BMW, but for
some reason they seemed to escape. Mebbe better quality control, mebbe
just that those cars were more likely to use distilled water rather than
tap water in the coolant, so the impurities didn't corrode out.

aluminium melts at a rather diferent temperature top copper

Cylinder heads are cast.


Copper wire is drawn.


Apples are not oranges.

Either way - the cause was exactly what you say is "inconceivable". ****
that survived re-smelting.

Believe your own BS then