Check the paper texture for a crisp, firm feel
Compare the bill to a known genuine bill of the same denomination
Look for watermarks when held up to light
Check the security thread embedded in the bill
Verify color-shifting ink on the denomination or seal
Inspect microprinting with a magnifier
Check for raised printing on genuine notes
Look for matching serial numbers and consistent font
Examine the bill under ultraviolet light if available
Check for blurry images, uneven borders, or poor alignment
Feel for thinness, smoothness, or waxy texture
Compare the portrait and details for sharpness and clarity
Look for missing security features specific to the currency
Use a counterfeit detection pen if appropriate for the currency
Verify the bill with a bank or cash-handling device if unsure