Prepare for the NOCTI Cosmetology Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Ace your exam!

Thinning nail polish is most commonly done using a solvent. Solvents are substances that dissolve other compounds, and in the case of nail polish, they help to reduce the viscosity or thickness, making it easier to apply smoothly. Common solvents used in nail polish include acetone and ethyl acetate, which are effective at breaking down the formulas without compromising the quality of the polish.

Acids, bases, and buffers serve different functions in chemistry and cosmetology. Acids can alter the pH of a substance, which is not relevant to thinning nail polish. Bases also adjust pH levels and can react differently with compounds, potentially altering the nail polish's effectiveness. Buffers are used to maintain pH levels in solutions, which again does not apply to the task of thinning nail polish. Thus, the appropriate method for thinning nail polish is through the use of a solvent.

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