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Benjamin Franklin made colonial paper money harder to counterfeit by combining detailed leaf impressions with special paper and deliberate differences in spelling and type. These were obstacles, not guarantees: counterfeiters eventually copied the leaf designs by transfer and tracing, so a note’s authenticity depends on several details considered together.
How Franklin’s leaf printing worked
Franklin’s shop used nature printing: an image made from the form and fine surface detail of a real leaf. The Library of Congress describes the process as a double casting. First, the printers made a plaster mold from a leaf; then they poured type metal into the mold’s impression. The resulting metal piece preserved the leaf’s raised veins and texture and could be mounted at type height for printing.
The method produced a detailed image that was difficult to reproduce by ordinary copying. Its precise technical explanation is a later reconstruction, not a complete procedure documented by Franklin himself. The Library of Congress connects the explanation to a surviving printing block and scholarship discussed by James Green in a 2013 Library Company of Philadelphia annual report.
The leaf image appeared on the reverse of some notes. Colonial Williamsburg says Pennsylvania notes were double-sided by 1739, with a different naturalistic leaf image on the reverse for each denomination. Its collection description says nature prints appeared on notes for several colonies and the Continental Congress until around 1780. That does not mean every note Franklin printed carried a leaf or used every security feature.
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Other features made copying more difficult
Paper containing mica
The Library of Congress identifies mica in the paper as another anti-counterfeiting feature. This worked in the paper itself, rather than in the printed design or text.
Spelling and typesetting differences
Franklin’s shop varied the spelling of “Pennsylvania” on some high-denomination notes and used combinations of typefaces, symbols, and punctuation. The Franklin Institute describes spelling variation as a feature thought to deter counterfeiting; institutional accounts do not express that explanation with identical certainty. These details made a note harder to reproduce accurately, but they are not proof of authenticity on their own.
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Franklin’s work covered more than one issuer
Franklin printed bills of credit for Pennsylvania and was also employed by New Jersey and Delaware, according to the Library of Congress. The Library’s collection account identifies notes associated with Pennsylvania, Delaware, Maryland, New Jersey, and the Continental Congress, including work by Franklin, David Hall, and William Sellers. Hall continued the business with Sellers after Franklin left, so a later Hall & Sellers note should not be described as personally printed by Franklin.
A Colonial Williamsburg collection example shows the distinction: an eight-dollar Continental Currency note dated May 10, 1775, was printed in Philadelphia by Hall & Sellers. Its catalog record places it within the broader period when nature prints were used, but does not make every feature a universal characteristic of every issue.
Why the safeguards eventually failed
Nature printing raised the difficulty of copying a note, but it did not make counterfeiting impossible. The Library of Congress reports that counterfeiters eventually reproduced the appearance of leaf designs by transfer and tracing, without casting a leaf. It also describes other frauds, including copying complete designs and adding a zero to change a denomination.
The broader lesson is that a striking leaf image was only one part of the system. Once counterfeiters found ways to imitate it, the other features—and the note’s specific issue and denomination—mattered more, not less.
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How to assess a surviving note
The Library of Congress recommends considering multiple details together. An individual note should be checked against the issue and denomination rather than judged by a single supposedly secret feature.
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- Issue date and denomination: Check whether that denomination was authorized for the date shown.
- Spelling and type: Look for the deliberate spelling, type, symbols, and punctuation appropriate to the issue, including any broken type noted for it.
- Paper: Consider the paper’s appearance and makeup, including whether it fits the relevant note.
- Signatures: Compare the signers with those authorized for the issue.
Condition can make a firm determination difficult, and the Library of Congress notes that even signatures can be convincingly faked. A leaf print, mica, an unusual spelling, or a signature should therefore be treated as one clue among several, not a guarantee.
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