substrate of most banknotes is made of paper, almost always from cotton fibres for strength and durability; in some cases linen or specially coloured or forensic fibres are added to give the paper added individuality and protect against counterfeiting. Paper substrate may also include windows based on laser-cut holes covered by a security foil with holographic elements. All of this makes it difficult to reproduce using common counterfeiting techniques.

Polymer

Some countries, including Canada,

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