At the trial, the police chemist testified that he conducted three color tests on 50 glassine envelopes that were randomly selected from the initial group of 499 such envelopes. Following positive indicator results, the chemist mixed the contents of the 50 glassines and conducted further microscopic, and chromatographic examinations, the results of which established the presence of heroin hydrochloride in the mixture whose aggregate weight was more than one-half ounce.
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