Yes, basma is traditionally combined with henna (lawsonia inermis powder) to achieve a wider range of deeper, cooler tones. When used alone, basma typically gives hair a darker, sometimes slightly blueish or greyish tint. When mixed with henna—which provides warm red and orange pigments—the two interact to produce various shades of brown, chestnut, or auburn, and with the right proportions, can approach a near-black result.
The final colour depends heavily on the mixing ratio and your starting hair colour. A common starting point for a medium brown is a 1:1 mix of henna and basma. For darker results, increase the proportion of basma. For a warmer, reddish-brown, use more henna. It's crucial to mix the two powders together dry first, then add your liquid (water, tea, etc.) to form a unified paste. Process and apply as one mixture. Because the outcome is influenced by your natural base colour, hair porosity, and processing time, a strand test with your chosen ratio is strongly recommended before applying to your whole head.