The paper that banknotes are printed on is not marketed commercially. Also, the chemical composition on the paper and ink is confidential. Even if you do not have much expertise in spotting a copyright, it is best to observe a clear change in texture. Microprinting: Tiny lettering that appears like https://juliusiklie.glifeblog.com/37505943/hong-kong-100-dollar-things-to-know-before-you-buy