What should a barber do before starting any service that involves chemicals?

Before starting any service that involves chemicals, it is essential for a barber to read and follow the manufacturer's instructions. This step ensures that the barber understands how to safely and effectively use the product, including specifics about application techniques, timing, and safety precautions. Each chemical product can have unique properties and requirements, and adhering to these guidelines helps prevent potential hazards, such as allergic reactions or skin irritations for the client, as well as ensuring the desired outcome of the service.

While assessing client preferences and preparing consultation forms are important components of the service process, they do not address the critical safety and procedural aspects directly related to the use of chemical products. Mixing all products in advance can lead to issues if not aligned with the specific instructions, which could potentially compromise the service's safety and efficacy. Therefore, focusing on the manufacturer's guidelines is the most crucial step before proceeding with any chemical treatment.