or even steganography.
stenography used to be an honorable if messy job back before modern copy machines.
Is there a reason to believe the US Treasury printed this?
I'm white. Nonwhites have taught me to be racist, by example. Asians, for example, are extremely racist.
Rather than trying to change everyone else, or pretending the world is different than it is (which is self-destructive in a competitive world), we should join the crowd with clear eyes.
Please do filter me.