List of security paper features

https://en.wikipedia.org/wiki/Security_printing

watermarks

simulated watermarks

intalgio printing

geometric lathe work

microprinting

optically variable ink

holograms

security threads

magnetic ink

serial numbers

anti-copying marks

copy-evident

prismatic coloration

halo

false positive-testing

flourescent and phosphorescent dyes

registration of features on both sides

electronic devices

thermochromatic ink

latent images

copy detection patterns and digital watermark