Statement commonly seen on packaging for heterogeneous substances that may separate over time. Things that should be shaken before using include buttermilk, italian dressing, chocolate milk, and juice containing pulp. Generally, you may be instructed to shake any liquid containing solid bits, or which mixes lipid-, water, and/or alcohol-based substances. There is always some wag who interprets this by trembling, then picking up the product and pouring.

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