Can I use this if I have previously chemically treated or bleached hair?

If your hair has been heavily bleached, very porous, or recently chemically treated, you should take extra caution when using this product. High porosity allows the plant pigments to absorb more rapidly and intensely, which can lead to a final tone that is darker or more uneven than expected. The gradual development of the color, which becomes clearer over 48 hours, may also appear more pronounced on damaged hair, potentially resulting in a stronger copper or red reflection than the "light brown" description suggests.

It is advisable to perform a strand test on a small, hidden section of hair before applying the product to your entire head. This will help you gauge how your specific hair condition interacts with the pigment. Additionally, as with any hair coloring product, a patch test is sensible before use, especially if you have sensitive skin or a history of reactions. Consult a specialist before use if you have chronic conditions or are pregnant or breastfeeding.