Three tests can be helpful here: scratch test, saltwater test and heating/smell test. Scratch test: Take a needle and scratch the stone in an unobtrusive spot; plastic will leave elastic shavings, while amber will crumble with small pieces that can be ground into powder. Saltwater test: Dilute 8 - 10 teaspoons of salt per glass of water and put the amber in the solution; plastics (Bakelite, Polybrene, Bernat (Bernit), celluloid and imitations from epoxy resins) drown in salty water, while amber will float. Heating test: Apply the hot tip of a needle to the amber surface; amber will smell like sweet pine, whereas plastic will have a sharp chemical smell.

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