Why is a strand test and skin sensitivity test recommended before full application?

Even though this is a natural product, the reaction of henna and indigo can vary significantly from person to person. A strand test is crucial because the final shade depends on your starting color and hair porosity. Light, porous, or previously dyed hair may absorb the plant pigments differently, potentially resulting in a tone that is darker or more orange than expected. Additionally, a skin sensitivity test is recommended before full application to check for any adverse reactions, especially if you have a sensitive scalp or are prone to irritation. Extra caution is advised if you have recently used chemical colorants or bleaching products, as the interaction between synthetic dyes and natural plant powders can be unpredictable. Performing these tests allows you to adjust the processing time or mixture consistency to achieve the desired visual density and tone without unexpected results or scalp discomfort.