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for safety reasons, before performing the main tests, very small samples (circa 10 mg) of the substance are subjected to heating without confinement in a gas flame, to shock in any convenient form of apparatus and to friction by the use of a mallet against an anvil or any form of friction machine.
ohutuse huvides rakendatakse väga väikestele proovidele (u 10 mg) enne põhikatsete tegemist kuumutamist gaasileegis vabas õhus, lööke mis tahes tavapärastes seadmetes ja hõõrdumist vasara ja alasi vahel või mis tahes muus hõõrdumisseadmes.