Benjamin Franklin was an early innovator of printing techniques that used colored threads, watermarks and imprints of natural objects such as leaves to make it far harder for others to create knockoffs of the paper bills he printed.
In this image provided by Proceedings of the National Academy of Sciences, blue threads can be seen in a six shillings Delaware note printed by J. Adams on January 1, 1776. Counterfeiters found it difficult to duplicate the note. – Benjamin Franklin was so busy as an inventor, publisher, scientist, diplomat and U.S. founding father that it’s easy to lose track of his accomplishments.
The new research, published Monday in the Proceedings of the National Academy of Sciences, describes data gathered with techniques such as spectroscopy and fluorescence tests, which use light to identify elements such as carbon, calcium and potassium in test samples. Researchers also used electron microscopes for imaging fine details.
The researchers examined Franklin's penchant for including watermarks, tiny indigo-dyed threads and “fillers” of special crystal in printed bills to create barriers to copycats. The paper also highlights Franklin's use of “nature printing,” a technique by which he transferred the detailed vein patterns of tree leaves to printing plates.
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