Jeannetty was paid L.T. 10.542/Ozt sometime around 1793. Assuming his platina was 70% Pt and without calculating refining cost,
c. 1793: 1 Troy Ounce platina (Est. 70% ore) = L.T. 10.542
c. 1793: 1 Troy Oz. Pt (.999 Ore) ~ L.T. 15.06
1793: 1 Troy Oz. Pt (Paris Labor, 1789) = L.T. 30.47 (S$ 7.92)
1793: 1 Troy Oz. Platinum (Paris First Base Cost) = L.T. 45.53 (S$ 11.83)
Although this may have been intercepted Spanish cargo (or ~two strong-boxes) of platina, it is more likely ore requested from and paid to the Casa de Platina directly @ ~3 Reals per Onza, a wholesale import European price.
The 1795 Paris price was known to be L.T. 81.4034 ; Janetty's higher price appears to be retail.
25/5/1793 : 226.375 Marcs = 1,781.345 Ozt (55.406 Kgs.) ∴
Where 1 Paris Marc cost L.T. 12 (S$ 3.12) apparently from the Spanish Crown,
226.375 Marcs (120.4425 Libras) cost L.T. 2,716.50 (5,646.76 Reales), so
1 Libra cost 46.88 Reales (S$ 5.86 ; L.T. 22.55), or at the Spanish Onza (0.9243 Ozt),
1 Onza cost S$ 0.3663 (2.93 Reales) x 1,927 Onzas = S$ 705.84
1793: 2.93 Reales/Onza = 46.88 Reales/Libra = S$ 5.86 at Madrid delivered to Paris.
May 1793: 1 Troy Ounce platina (Spanish Crown) = L.T. 1.525 (S$ 0.40, R. 3.17)
1793: 1 Troy Oz. Pt (Spanish Whols., intrinsic ) = L.T. 2.1785 (S$ 0.57)c. 1793: 1 Troy Ounce platina (Est. 70% ore) = L.T. 10.542
c. 1793: 1 Troy Oz. Pt (.999 Ore) ~ L.T. 15.06
1793: 1 Troy Oz. Pt (Paris Labor, 1789) = L.T. 30.47 (S$ 7.92)
1793: 1 Troy Oz. Platinum (Paris First Base Cost) = L.T. 45.53 (S$ 11.83)
Although this may have been intercepted Spanish cargo (or ~two strong-boxes) of platina, it is more likely ore requested from and paid to the Casa de Platina directly @ ~3 Reals per Onza, a wholesale import European price.
The 1795 Paris price was known to be L.T. 81.4034 ; Janetty's higher price appears to be retail.
25/5/1793 : 226.375 Marcs = 1,781.345 Ozt (55.406 Kgs.) ∴
Where 1 Paris Marc cost L.T. 12 (S$ 3.12) apparently from the Spanish Crown,
226.375 Marcs (120.4425 Libras) cost L.T. 2,716.50 (5,646.76 Reales), so
1 Libra cost 46.88 Reales (S$ 5.86 ; L.T. 22.55), or at the Spanish Onza (0.9243 Ozt),
1 Onza cost S$ 0.3663 (2.93 Reales) x 1,927 Onzas = S$ 705.84
1793: 2.93 Reales/Onza = 46.88 Reales/Libra = S$ 5.86 at Madrid delivered to Paris.
May 1793: 1 Troy Ounce platina (Spanish Crown) = L.T. 1.525 (S$ 0.40, R. 3.17)
1793: 1 Troy Oz. Pt (Paris Labor, 1789) = L.T. 30.47 (S$ 7.92)
1793: 1 Troy Oz. Platinum (Paris Cost) = L.T. 32.65 (S$ 8.48)
Citation: Oeuvres, Vol. 6; Antoine Laurent Lavoisier, France. Ministère de l'éducation nationale (18 ) p.679
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