how to darken mehndi on feet nails
1 Make a fine paste line near your top knuckle, and let that dry. 2  Apply thick henna paste up to that line. 3  As the paste dries and bare spots open up, fill those in with more henna. 4  Leave that on for one hour or more. 5  For darker color and more even stain, scrape the paste back and reapply henna a second time.he stain may be dark as the picture at the top of the page or a deep red color, depending on your skin and the henna you use. Other techniques from history: 1  Mix the henna very thick, like pie dough, and press the thick paste onto your fingertips and fingernails.