After a long research period, we have found the power of Eucalyptus. Our goal: create the longest henna skin stain possible. Eucalyptus is the ingredient that will help with creating a longer-lasting result for the Brow Henna treatments. The Color Developer can be mixed with different shades and colors of Brow Henna. Mixing drops of the Color Developer together with your henna powder, following the indicated ratio, helps intensify the henna color, and ensures the henna sets better. Pro Tip: Difficulties with getting a long-lasting Brow henna skin stain? Try our Color Booster in combination with Color Developer. This trick works especially well for oily skin.