On Platina.: 1791

According to an August 1791 Letter of Seguin, the French were accumulating "100 Livres"
(48.95 Kgs = 1,573.8 Ozt) platina for the construction of weights & measures in Platinum.

Where 1 Paris Marc = 244.753 Grammes = 7.869 Ozt cost L.T. 64,

1791: 1 Troy Ounce platina (trade: Gengembre's ore) = L.T. 8.13

Citation: Oeuvres, Vol. 6; Antoine Laurent Lavoisier, France. Ministère de l'éducation nationale (18 ) p.679

Uncertain: assuming per libra, c.1790-5? : 1 Troy Ounce platina (Choco source) = £0.1690

Germany, 1791: 8 days travel from Paris. Leipzig Price.

Garbling the name "Rio San Juan del Choco" platina was sold at an exceedingly high rate; where 5 Rthlr was a Louis d'Or, platina cost a Pound Sterling per ounce Troy. This very high cited price - almost certainly a retail price - was more than 3x higher than Jeannety's bulk-rate platina cost, charged for the weight-standards.

November, 1791: Platina was 3x as expensive in Leipzig as London and the price would fall more than 2/3rds by 1819

Leipzig. Mineralogy and even more so Chemistry lovers are hereby made aware that at the best platina to get is from America and called "Platina del Pinto" and "del Shouo" ; an ounce will cost up to Rthlr 6.

Christian Friedr. Laminir.

Late December, 1791: 1 Troy Oz. platina (ore, retail) = Rthl 6.38 (£ 1.02; Fr 25.50 - 27.) ~ Fr 41.63; £1.038; M 13.19

~Three Dutch or German Ducats ; 19 Hamburg Marks

Although not specified as such, Priestly's price-weight is entirely consistent with platina ore at avirdupois. Where 8 ounces avd = 7.292 English Troy Ounces,

"Richard Knight and His Production of Malleable Platinum"(PMR Vol. 29, #1, 1985; p. 30)

Priestley was also sufficiently interested in platinum to purchase a modest amount; his claim for compensation after the destruction of his house and laboratory on July 14, 1791 includes the item “Half a pound of platinum £ 2 8 s. 0 d.”

c.1791: 1 Troy Ounce of platina (ore) = £0.33

c.1790: 1 Troy Ounce of Platinum (Paris mfg.) ~ "a bit less than Gold."

"Price of Platinumware depends, as in gold and silver, according to the difficulty and type of work, it is somewhat lower than that of gold."

Citation: Naturgeschichte und Technologie: für Lehrer in Schulen und für Liebhaber ...Carl Philipp Funke p.371 (Wien & Prag, 1792) p.373