At 16:48 19/06/2007, Trevor Dunkerley wrote:
>This material is mixed with the debris of wood, coal ash (we have
>ascertained through analysis that smelters were using coal to smelt
>galena on this site in 16/17th century), and pieces of roasted
>galena. It is certainly bone ash which has taken on a yellow colour
>but does not appear to have absorbed the lead oxides.
Sarah Paynter has attributed the high phosphor levels in some of the
slag residues from the site at Combe Martin to the return of litharge
cakes, containing bone ash, to the hearth to recover the lead (see
and go to North Devon, item 8). What you are seeing is probably
unused bone ash discarded during or at the termination of the refining process.
Dr Peter Claughton,
Blaenpant Morfil, nr. Rosebush, Clynderwen, Pembrokeshire, Wales SA66 7RE.
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