What is a key safety precaution when using chemical treatments on hair?

Wearing gloves and following manufacturer instructions carefully is crucial when using chemical treatments on hair. These treatments often contain potent chemicals that can be harmful to both the user and the client if not handled properly. Gloves serve to protect the skin from potential burns, irritation, or allergic reactions that can arise from direct contact with these substances.

Additionally, adhering to the manufacturer’s instructions ensures that the chemical is used safely and effectively. These instructions are specifically designed to maximize the treatment's efficacy while minimizing risks. By following the recommended guidelines for application time, dilution ratios, and safety precautions, the cosmetologist can achieve the desired results without compromising safety.

The other options may result in unsafe practices. Applying product on wet hair can lead to uneven application and potential chemical reactions that are not intended. Using heat tools immediately after applying a chemical treatment can intensify chemical reactions that could damage the hair or scalp. Mixing different chemicals together without guidance can create dangerous reactions that result in harmful fumes or severe damage to the hair and skin. Thus, wearing gloves and following instructions stands out as the safest and most responsible approach in this context.