[forensic-science] Copper and Zinc in inks

 

I've found various references to copper and zinc in inks, and how the amounts of these metals in any samples, can help compare those samples. I have a couple of questions related to this:

1) When, historically, did copper and zinc first begin appearing in inks?

2) Is the presence of these metals a result of the manufacturing process, or in the use of the ink? I mean, is it from the ball in a pen rotating in it's socket, or the use of a brass inkwell... or is it in the ink itself to begin with?

3) Can anyone point me to a database of copper and zinc amounts in ink, correlated to time (years, centuries) or geography (who use inks which might have these metals)?

Thanks in advance for any help. Rich.

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