The Sincerely Discovered Art of Assaying and Refining of the Venetians

vessel. Pour water over it, let it stand for one day, then strain it off.

If you have a piece of ore that will not flow, lift the ore with tongs into the fire, and quench it while it glows with the lye until it has had enough. Then pound it into powder, and it will let itself be melted and flow in the fire. However, clean it beforehand in a shallow trough before you melt it, dry it, and proceed as before.

On the gravel In mining, Kieß refers to pyrite or pyritic ores. of the mines.

If it has a mark A standard unit of weight, often used for assessing ore quality., you should add to it bismuth, or marcasite and litharge, 4 lots A lot is a unit of weight, approximately 1/16th of a pound. of glass-gall. Mix it all together, then take the silver and put that into a crucible at the bottom, and the powder on top of it, and on the powder lead. Let that flow for 4 or 5 hours, then let it become cold, so the king A term for the regulus or metallic button resulting from smelting. has settled at the bottom.

Take this king, set it in a cupel A porous vessel used in refining., and drive it off Refine via cupellation.. Pour it into an ingot mold, which must be greased beforehand with tallow, and test it to see if it is malleable with a hammer. If it is not malleable, take a little copper to it, and pour it again as before, so it becomes malleable.

Notice for the other ores.

Take copper and lead, one as much as the other, mix