Check the paper quality and feel for a crisp, slightly rough texture
Hold the note to the light and verify the watermark of Benjamin Franklin
Look for the blue 3D security ribbon embedded in the bill
Tilt the note to see the color-shifting ink on the lower right number 100
Check the security thread that glows pink under ultraviolet light
Verify the portrait of Benjamin Franklin is sharp and detailed
Inspect the microprinting around the portrait and security features
Check the raised printing by lightly feeling the ink on the note
Examine the color-shifting bell in the inkwell on newer notes
Compare the note with a known genuine bill for size, color, and detail
Use a counterfeit detection pen if needed
Check the serial numbers for even spacing and matching ink color
Look for blurry edges, misspellings, or uneven printing
Confirm the Federal Reserve and Treasury seals are clear and properly aligned