How do you make henna darker?

To make henna darker, you can apply a mixture of lemon juice and sugar on the henna design after it has dried, as this helps to enhance the stain. Additionally, leaving the paste on for a longer period, ideally 8-12 hours, allows for a deeper color. Using a higher quality henna powder and ensuring that the paste is fresh and properly mixed can also contribute to a richer, darker stain. Lastly, keeping the area warm during the dye release can intensify the color.