Hold the bills up to light and look for the magnetic strip.
also look that the face on the bill matches the face on the right side that you will see when holding up to the light. $5 bills have a big 5 on the side.
Red and blue fibers are on all mint paper.
The magnetic strips are not located in the same spot, On a twenty the strip is all the way to the left and says twenty usa, on a five its to the right of the middle and says five usa.
Ive seen some $5 bills that were bleached then reprinted as $100 bills. The conterfit pens only show if its mint paper or not so using a pen on a conterfit will not always be correct method to identify a fake.
Ive also seen conterfits that looked to be marked by a counterfit pen but was actually a coffee stain made to look like a conterfit pen was used on a legit bill.
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