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There's a security thread that runs to the left of the portrait. When held to the light you can see 100 and USA in an alternating pattern on both sides of the bill. The thread is pink when seen under an ultraviolet light.
When you move your finger along Franklin's left shoulder it will feel rough a result of the printing process.
Small words are printed on Franklin's jacket collar, along the blank space containing the watermark, along the golden quill, and along the note borders.