Which method involves mixing an ingredient with small amounts of indentical substances until thoroughly blended?

Geometric dilution is a method used in pharmacy and compounding to ensure that a small quantity of an active ingredient is evenly mixed with a larger quantity of diluent or excipient. This technique involves taking equal parts of the active ingredient and the diluent, mixing them thoroughly, and then gradually adding more diluent in the same proportion. By using this systematic approach, it achieves a consistent and uniform mixture, which is critical for ensuring accurate dosages and effectiveness in pharmaceutical preparations.

Other methods listed, such as batch mixing or homogenization, refer to different processes. Batch mixing might not specifically follow the same stepwise approach necessary for geometric dilution, while homogenization generally implies reducing particle size and achieving a uniform dispersion, which is not the same as the methodical blending of solids utilized in geometric dilution. Solutions refer to a homogenous mixture of solutes and solvents, which does not directly apply to the method concerned with powders or solid ingredients.