ELi5: Why does colour shifting occur on Canadian banknotes

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I’m doing a research project for a chemistry class and we need to create a brochure about how chemistry is used to battle counterfeit currency.
Chemistry is not my subject at all.
While I have most of the project done, can someone explain why, on Canadian banknotes, colour-shifting occurs? I’m referring to aspects like the feather on one bill going gold to green when moved up and down.
Thank you!

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