First make sure before applying the mehendi that ur hands are well moisturised but not oily nor too dry or flaky.
One of the most desi totkaβs mehendi waliβs advise is to apply a mixture of lemon juice n suger on yr hands when the mehendi is dryβ¦and then to warm yr hands on the stove.
Note: dont BBQ yr hands just keep it far enuff to feel a comfortable warmth
Incase u rnt comfortable withthe sticky lemon n sugar concotion then u cud apply sum Balm on yr hands n then warm em.
They do help to darken the mehendi considerably!
Hope that helps
May u have beautifull dark mehendi this Eid