Several later sources cite this price for what is clearly worked platinum. This particular authority is the Mint assayer, but the basis for this price estimation is unclear: coin rate or semi-refined ingot?
c.1840: 1 Troy Ounce Platinum (imported? market) = $ 6.80
c.1841: 1 Troy Ounce platina (ore) = $ 4.39
c.1841: 1 Troy Ounce platina (ore) = $ 4.39
The Price of Platinum in the USA was falling in the 1840s.
Citation: A manual of gold and silver coins of all nations struck within the past... By Jacob Eckfeldt (1842) p.111
The isolation of the other Platinum Group Metals was still novel; "purity"claims before this date is therefore highly suspect. Commercial articles for sale may be supposed impure, through the 19th Century.
1840: Philadelphia
Chemical Apparatus in Laboratory, viz: — Pnematic trough, and hydrogen oxygen blow pipes; 1 large and
1 small chemical furnaces; 2 gasstoves, table blow pipe, platinum crucible; 4glass and 3 iron retorts; specific gravity apparatus for gas; glass tubes; test glasses; evaporating dishes; acids, and other chemicals; 2 mortars and pestles; 1 Argand lamp; photemeter case of drawers; small patent balances, etc. .... $100. 00
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