"count, pour, lick and stick" - What does the "lick" part refer to?

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I often hear to the term "count, pour, lick and stick" when referring to the old days of pharmacy. What exactly does the "lick" part refer to?

The whole idea of licking ANYTHING in a pharmacy seems odd to me.

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"count, pour, lick and stick" - What does the "lick" part refer to?