Is the dark chestnut henna cream suitable for hair that has already been dyed with chemical colour? — Henna cream strengthening 50 ml Dark chestnut (Fitokosmetik)

The card does not name the compatibility of the henna cream with hair dyed with chemical colour and does not describe the shade on such hair. It says: apply to slightly damp hair for 10–30 minutes and rinse. The composition (INCI) is not given on the card.

General information (not a manufacturer's instruction): before colouring the whole head, the shade and the skin's reaction can be tested on a thin strand and a small patch of skin.