Quote:
Originally Posted by SetBuilder
Perhaps a Walnut ink of some sort? Not all was iron gall back then. For the average person it was too complicated to make, so many people would grind up bark, walnut husks, or insects, boil it, and then mix it with a binder. No iron sulfate was added.
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The primary components for the 5c 1847 are - Calcium carbonate, Lead sulfide, and lead sesquioxide (red lead)
http://chronicle.uspcs.org/pdf/Chronicle_252/21674.pdf
That may not come through, as the articles after a certain date are members only.
Printing inks would of course vary a lot from pen inks, as the properties need to be a lot different.