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What technique is used in mixing two ingredients of unequal quantities?

A Geometric dilution

Geometric dilution is a technique used in mixing two ingredients of unequal quantities, in which one begins with the smallest quantity and adds an equal quantity of the ingredient having the larger amount; the process continues until all of the ingredients are used. Blending is an act of combining two substances together. Levigation is trituration of a powder drug with a solvent, in which the drug is insoluble with the solvent. Spatulation is mixing powders using a spatula in a mortar, an ointment slab, or a plastic bag; it is a process used when ingredients may liquefy on mixing; there is no reduction in particle size.