The Sincerely Discovered Art of Assaying and Refining of the Venetians

it together. Then take gravel Kieß from the mine for silver, hammer the previous pieces to it, and add to it melted salt and glass-gall. Mix it together, and drive it as often as you wish. If it will not be malleable, add copper to it; the more copper, the richer the gold becomes.

How to drive lead correctly.

Take a shard from a thick pot that is very strong; then take 4 lots of ore, pound it to powder, and 1 lot of litharge, pound it small also, and mix ore and litharge together. Take the lead and put it into a crucible, and let the lead melt. When it has melted, carry a little of the ore, and then a little more, onto it until it is finally all entered. Let it then drive well. When it drives purely, let it melt further, then it becomes truly pure. If it would not, however, drive and flow well, then take the flux-powder, as mentioned above, onto it.

On any kind of mine that is tough and will not allow itself to be worked in the flow and is not malleable.

For this you should take fresh unslaked lime 6 to 7 lbs. Pour hot water on it, a good portion, and let it stand 6 or 8 days. Strain it off then. When you have strained it off, take a small piece of an ore, put the same piece in