1910: 1 Troy Ounce of platina = £ 6.97 (USD$ 33.86)
1910: 1 Troy Ounce of Platinum = USD$ 33.70
1910: 1 Troy Oz. Chlor-Platinate Solution = £ 1.3719 (USD$ 6.66)
If 1 Troy Oz of Platinum solution has not more than 94 grains of pure Platinum, where 1 lb. avd. Solution has less than ~2.87 ozt pure Pt.
Citation: Platers' Guide: With which is Combined Brass World, Vol. 7 (Dec. 1910)
1910: 1 Troy Ounce of Iridium (Source, bulk) = £ 9.95 (USD$ 48.37)
1910: 1 Troy Ounce of Rhodium (whols.) = £ 18.66 (USD$ 90.70)
Citation: Treatise on general and industrial inorganic chemistry; Ettore Molinari (1920) p.850
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