The duration required for henna paste to achieve dryness is variable, influenced by several environmental and application-specific factors. A paste is considered dry when the surface is no longer moist to the touch and the paste begins to crack slightly. This process is a necessary precursor to achieving optimal staining results.
Proper drying is essential for effective skin staining because it allows the dye molecules, lawsone, to adequately bind with the keratin in the skin. Allowing sufficient time for this process enhances the depth and longevity of the resulting temporary tattoo. Historically, various cultures have employed different techniques to encourage optimal drying, including the application of sugar-lemon mixtures to maintain moisture and prolong contact.