Its funny that I found it. Here it is ,I always wanted to use same ink with my pen. Its intaglio printing press ink. Anyone interested in
printing engravings ...
United States Patent 5,100,934
Glesias March 31, 1992
Heatset...
printing engravings ...
United States Patent 5,100,934
Glesias March 31, 1992
Heatset...
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