When
Cooley's Cyclopedia of Practical Receipts and Collateral Information · 1880 · p. 11
the two are similar, the quality or ‘finene ’ is considered to be the same. The marks are then further examined by heating the ‘touch-stone’ to redne , and moistening the strokes with aquafortis, when the appearance resulting from oxidation, ., differ according to the nature and quantity of the alloy. A nearly similar method is sometimes adopted with SILVER ; but the characteristics are scarcely so distinct with the metal. (See above .)
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