Missouri Board of Cosmetology Practice Exam 2026 - Free Cosmetology Practice Questions and Study Guide

Question: 1 / 400

What chemical in hair products can create a strong odor and should be used in a well-ventilated area?

Hydrogen peroxide

Alcohol

Silicone

Ammonia

Ammonia is the correct answer because it is a chemical commonly found in many hair products, particularly in hair color and bleaching agents. It has a strong, pungent odor that can be irritating to the eyes, skin, and respiratory system. Therefore, it is crucial to use products containing ammonia in a well-ventilated area to minimize inhalation risks and exposure to the fumes. Proper ventilation helps prevent the buildup of ammonia vapors, making the environment safer for both the stylist and the client.

While hydrogen peroxide and alcohol are also used in some hair products, they do not typically have the same level of strong odor or require as stringent ventilation measures as ammonia. Silicone is primarily used for its smoothing and conditioning properties and does not create a problematic odor, making it less of a concern when it comes to ventilation.

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