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Omega,
The ink you are looking for is made by New England Graphics. It is a black acid resitant ink made for etching newspaper printing plates. It is really good stuff. I don't have their address. It has been so long since I have done acid etching that I have lost all those contacts. I remember that New England Graphics is the name of the company. Maybe a Google search will help you find them.
The acid will eat at the sides unless you carefully resist those between acid baths. That is why acid etshing always has a slightly ragged edge compared to a cut line.
Ray
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