Louisiana Cosmetology Board Practice Exam 2025 - Free Cosmetology Practice Questions and Study Guide

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What is the legal limit of whitening agent in most bleaching products?

0-10% peroxide

12-40% peroxide

The legal limit of whitening agent in most bleaching products is typically within the range of 12-40% peroxide. This concentration range is considered effective for achieving desired results in hair bleaching while also ensuring a relatively safe application when used according to guidelines.

Peroxide acts as a bleaching agent by penetrating the hair shaft and breaking down the natural pigment. Concentrations below this range may not provide sufficient lightening effects for professional treatments, while those above could increase the risk of hair damage or adverse reactions for clients. Regulatory standards in cosmetology focus on maintaining effectiveness and safety, which is why this range is widely accepted in the industry.

Understanding the appropriate limits of peroxide in bleaching products is essential for cosmetology professionals to ensure they deliver safe and effective results in their treatments.

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30-60% peroxide

50-70% peroxide

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