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To si ho miesali sami na kolene

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Každá zkoušečka měla jiný systém měření (kolečko, ručička, taky to stlačovalo měděný váleček - co si kdo vymyslel, aby to prodal), ale vždy šlo o definované množství prachu - vždy stejné. Odměrka byla většinou integrální součástí zkoušečky.
Kvalita prachu se měnila nejen podle výrobců, jemnosti rozemletí substancí, velikosti zrn a jejich stejnoměrnosti, ale taky podle navlhnutí během skladování (a to i u konečného spotřebitele).