Answering your questions about silversmithing & silver restoration.
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Re: 15th century silver alloys?

I read over your initial question. A very small amount of silver would have been required to do silverpoint sketching since the paper abrades a minute amount to lay down a thin film of silver that eventually darkens to create the image. I suspect the coinage of the Da Vinci's day may have provided enough silver to refine and make into the stylus he may have used.