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Platinum Yellow

Our own opinion of this costly preparation is that the good qualities of
the product do not justify its price. It may be obtained as a bright,
rich, deep yellow, of considerable transparency; but the colour is acted
upon by foul gas and exposure. Even in a book we have found it assume a
dirty greyish cast, and a specimen which had been kept in a drawer,
wrapped up in paper, became perfectly black in a few years. The presence
of palladium interferes with the beauty of the original tint, but does
not affect its stability.

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