In 1856, Pure Gold Sheet (£ 5.50) was 3.67x more expensive than Platinum Sheet, which was 4x more expensive than Silver Sheet (£ 0.43).
1857: 1 Troy Ounce Platinum (Semi-Mfg, Retail) = £ 1.65 (USD$ 8.05)
1857: 1 Troy Oz. Gold (Semi-Mfg, Ret.) = £ 5.50 (USD$ 26.91)
1857: 1 Troy Oz. Silver (Semi-Mfg, Ret.) = £ 0.40 (USD$ 1.96)
The additional cost of the Platinum estimated at £ 0.325 or 6.5s., the 3"x6" sheet weighs 0.1975 Ozt (6.14 Grams, 94.8 Grains Troy): £ 0.0181 and 5.3 Grains per sq. in.
Grove's Battery (Platinum Plate, 18 sq. in./36 sq. in. surface) : £ 1.05
Where a Grove's Battery (Small Platinum Plate) cost £ 0.525, the Platinum was 2.75s. over the Smee Battery.
Citation: Griffin Advertisement in Catalogue of the Educational Division of the South Kensington Museum (1857) p.26
Other PGMs rising, c.1850-8:
c.1850?: 1 Troy Oz. Platinum (Whols., Residue: Ir, Rh, etc.) = £ 0.2743
1857: 1 Troy Oz. PGMs (Whols, Residue: Ir, Rh, etc.) = £ 1.10 - 1.34 ($5.37-6.54)
1857: 1 Troy Ounce Iridium (Ore, Best grain) = £ 8.0 (USD$ 39.12)
1857: 1 Troy Ounce Iridium (Ore, Worst grain) = £ 0.75 (USD$ 3.67)
Citation: The Civil Engineer and Architect's Journal, Vol. 20 ; William Laxton, 1857, p.151
Citation: Journal, Vol. 6 ; Royal Society of Arts (1858) p.361
(English?) Dental alloy, c.1857: 71.4% Ag - 28.6% Pt (Retail Cost est. ~£ 0.76)
Humby's Dental alloy, c.1857: 52.6% Ag, 26.3% Pt, 5.3% Au, 15.8% Zn
UK platina imports (1857): ~30% from Russia, as ore? Johnson & Matthey were likely importing Russian Scrap (pure) and ore (~75%) simultaneously.
St. Thomas/ Caribbean (Colombian) = 68%
Germany (Russian) = 18.82%
Russia (Russian) = 11%
France (Ru?) = 2.14%
Colombian 84% Ore @ £ 0.8653 = 14,383 Ozt., or 12,082 Ozt. Fine Pt
Russian 75% Ore @£ 0.7281 = 5,315 Ozt., or 3,986 Ozt. Fine Pt
Russian Scrap @£ 0.9707 = 7,087 Ozt. Fine Pt
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