Check the paper texture for unusual smoothness, thickness, or stiffness
Hold the bill to light and look for the watermark
Look for the security thread embedded in the note
Tilt the bill to see color-shifting ink
Inspect the printing quality for blurry lines or faded details
Compare the bill to a known genuine note of the same denomination
Feel for raised printing on genuine currency
Check for microprinting with a magnifying glass
Verify the serial numbers are evenly spaced and match the bill style
Look for correct alignment of front and back printing
Check for missing security features specific to the currency
Use a counterfeit detection pen if appropriate for the currency
Examine the bill under ultraviolet light if available
Be cautious of bills that feel too perfect, too shiny, or too flimsy