What is the general guideline for working with bleach in hair coloring?

The guideline to always use bleach in a well-ventilated area and to follow application instructions carefully is crucial for several reasons. First, bleach contains strong chemicals that can release fumes which are harmful when inhaled, making adequate ventilation necessary to ensure a safe working environment for both the stylist and the client. Following application instructions precisely helps to achieve the desired results while minimizing the risks of over-processing the hair, which can lead to severe damage or breakage.

In contrast, mixing bleach with shampoo or applying it directly to dry hair can not only compromise the effectiveness of the bleaching process but may also increase the likelihood of damage. Bleaching should ideally be applied to damp hair to ensure even distribution and to prevent excessive dryness during processing. Using bleach only on previously colored hair is another misleading practice; while caution is required with colored hair, bleach can be used on natural hair as well, provided the correct techniques are applied. Thus, prioritizing ventilation and careful adherence to guidelines is fundamental for safety and optimal results in hair coloring with bleach.