Quote:
Originally Posted by Fred
Interesting : Bronze yes, aluminium no,iron not much, this is a clue!
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A clue ?
I think explaination is about easy... and empiric...
Iron rust and dissolves over the years if not thick or compact enough. So not big issue...
Aluminium production was just by after 1825 (though the electricity required to product it made its diffusion before 1900 very rare in the world... if not impossible to find in many places , including Paraguay).
So, always assuming the LRLs work as he said, the OLD buried aluminium is max 100 years old there... but probably much is just from less than 60years... foil... pull-tabs etc
Sure not few time... but enough to develop a strong halo or "phenomenon" ?
He wrote of 30years old cans if I remember well... in that case seems the cans developed strong halo stuff...
I, indeed think that aluminium is really easy detectable if bronze or copper are, don't forget that gold have similar magnetic behaviour as aluminium... that's why using too much disc in an VLF to avoid pull-tabs (aluminium) it's really likly kill your gold ring founds too!
Kind regards,
Max