France, 1792: Platina; Discourse on Money

Where the Paris Marc (0.24475 Kg) = 7.86889533 Ozt., 28 Marcs = 6.853 Kg or 220.33 Ozt.

Lavoisier had bought from Breguet in January 1792, "28 Marcs of platina at 9 Livres per Once, which comes to a sum of 2,016 Livres Tournois."

1792: 1 Troy Ounce platina (Paris: whols, 75% ore) = L.T. 9.15
1792: 1 Troy Ounce platina (Paris: Pt at purity) = L.T. 12.20
1792: 1 Troy Ounce Pt (Paris: Labor) = L.T. 10.574