1,763°F is not three times 621.5°F. The Fahrenheit scale is not absolute temperature.Pawpaw wrote:Melting and casting silver is several orders of magnitude more difficult than lean.
Lead melting point: 621.5°F
Silver melting point: 1,763°F
While lead can be melted in an electric pot, silver is going to require a furnace. I doubt normal lead-casting molds would work well (or at least very long) at nearly 3 times the temperature.
You just can't do it over a campfire like the Lone Ranger.
To make the comparison, you must first convert to absolute temperature, the Rankine scale by adding 459.69 to the Fahrenheit temperature. The ratio is (1763+459.69)/(621.5+459.69) = 2.06, or roughly double.