gold refining assay Cupellation with lead and bone ash crucible an ancient technique for purifying gold silver or other noble metal
Palabras clave
gold,
refining,
refine,
assay,
artisan,
blowtorch,
casting,
closeup,
craftsmanship,
crucible,
equipment,
fire,
goldsmith,
hand-held,
heat,
jeweller,
jewellery,
lead,
liquid,
master,
melt,
metal,
metallurgy,
metalwork,
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noble,
piece,
platinum,
precious,
production,
distilled,
silver,
smelting,
torch,
men at work,
workplace,
workshop,
18,
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