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<p>[QUOTE="Juan Blanco, post: 1657452, member: 41665"]Mousse de platine (éponge de platine), Platinschwamm, Spugua di platino...</p><p><br /></p><p>First time I saw early 19th Century references to "platina sponge" I was baffled. </p><p><br /></p><p>The first English langauge reference I've found is <i>The Philosophical Magazine</i>,Vol. 37 (1811), XIII "On the purification of Platina" by M. {Hippolyte-Victor} Descostils; it was "éponge métallique" in the original <i>Mémoires de physique et de chimie (1807), p.</i>378. I think the term originated around 1801 (<i><span style="color: #222222">Le résidu qui étoit du platine très pur</span>... l'<span style="color: #000000">éponge métallique</span> imbibée du muriate de potasse...</i> etc.) in Paris. </p><p><br /></p><p>This was how the few late 18th C. chemists produced & sold semi-refined platinum, as precipitate metal powder. Hammered, thin plates (ingot) cost more, as much as Gold. The UK price dropped dramatically a few years before Dr. Wollaston (who discovered Rhodium in 1803) began merchandizing his Platinum sheets in 1805. </p><p><br /></p><p>Circa 1820, the producer-cost was estimated at £ 3.13/ozt and retail value at £ 15./ozt. Tthe Knight brothers of Foster's Lane were selling Rhodium after 1805, but I have not been able to reconstruct an early price chart for Rh from this period. (We may presume Rh was twice the price of Pd, but I haven't seen evidence to prove this.)</p><p><br /></p><p>By 1835, Rhodium had fallen to <a href="http://noblemetals.blogspot.com/2010/05/uk-18345-chemists-catalogue.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://noblemetals.blogspot.com/2010/05/uk-18345-chemists-catalogue.html" rel="nofollow">abit more than the POG.</a> Rhodium has historically traded at 15x-20x POG; in relative terms, this PM is very <i>very </i>CHEAP now. In fact, we are near the historic, all-time low.[/QUOTE]</p><p><br /></p>
[QUOTE="Juan Blanco, post: 1657452, member: 41665"]Mousse de platine (éponge de platine), Platinschwamm, Spugua di platino... First time I saw early 19th Century references to "platina sponge" I was baffled. The first English langauge reference I've found is [I]The Philosophical Magazine[/I],Vol. 37 (1811), XIII "On the purification of Platina" by M. {Hippolyte-Victor} Descostils; it was "éponge métallique" in the original [I]Mémoires de physique et de chimie (1807), p.[/I]378. I think the term originated around 1801 ([I][COLOR=#222222]Le résidu qui étoit du platine très pur[/COLOR]... l'[COLOR=#000000]éponge métallique[/COLOR] imbibée du muriate de potasse...[/I] etc.) in Paris. This was how the few late 18th C. chemists produced & sold semi-refined platinum, as precipitate metal powder. Hammered, thin plates (ingot) cost more, as much as Gold. The UK price dropped dramatically a few years before Dr. Wollaston (who discovered Rhodium in 1803) began merchandizing his Platinum sheets in 1805. Circa 1820, the producer-cost was estimated at £ 3.13/ozt and retail value at £ 15./ozt. Tthe Knight brothers of Foster's Lane were selling Rhodium after 1805, but I have not been able to reconstruct an early price chart for Rh from this period. (We may presume Rh was twice the price of Pd, but I haven't seen evidence to prove this.) By 1835, Rhodium had fallen to [URL="http://noblemetals.blogspot.com/2010/05/uk-18345-chemists-catalogue.html"]abit more than the POG.[/URL] Rhodium has historically traded at 15x-20x POG; in relative terms, this PM is very [I]very [/I]CHEAP now. In fact, we are near the historic, all-time low.[/QUOTE]
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