Make sure the henna powder you are using is fresh and of high quality. Older henna powder tends to lose its potency and may not give you a dark colour.
Prepare The Paste
Take a bowl and mix the henna powder with lemon juice. The colour is improved with lemon juice, which also aids in the henna's dye release.
Let The Paste Rest
When you are finished, cover the bowl with plastic wrap and allow the paste to sit for at least 6 to 8 hours, if not overnight. Due to the dye's complete escape, the colour is now a darker shade.
Apply Heat
After applying henna paste to your skin, cover it with tissues or plastic wrap. Then, after that, heat it gently with a blow dryer.
Aftercare
For the following 24-48 hours, stay away from excessive water contact to preserve a darker colour. Throughout this period, applying a mixture of lemon juice and sugar to the dried henna design once or twice might help intensify the colour even more.