Northern Earth's magazine kindly reviewed The Broken Stone and the secret of the Heavens' Henge for their spring 2012 issue this month. The problem of evidence for tin was mentioned and the review reminded me about something I have been meaning to add to the blog for a while.
Tin:
The problem of evidence:
Unalloyed tin suffers from "tin pest" at temperatures below 13 Celcius, resulting in a gradual transformation into dust (refer to: wikipedia, tin pest). Even
had objects been made from Cornish tin, there would be no evidence of
the original form unless they had been transported to a warmer
climate or kept in a heated internal environment.
