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|[[File:MeasuringOpacity.png|center|400px200px]]
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| style="height:20px; width:200px; text-align:center;" |This [[diagram]] shows a possible setup for identifying when a [[mixture]] becomes [[opaque]] during a [[Chemical Reaction|reaction]]by drawing a black cross on a white tile and [[observe|observing]] until the cross can no longer be seen.
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