There was an error updating your website from the Core central servers. Please go online and try running the site again so that the site may complete the update process. The system may be unstable until this step has been completed.

What colour will it be?

Henna has only one dye molecule that stains the skin only one colour. That colour will appear different from orange - reddish brown - dark mocha - black cherry.  Why the variation on one colour?

Thickness of skin: the more layers of stained skin, the darker the henna will appear (think a folded sheer material).   This is why the fingertips can become a dark black cherry colour.
Following instructions: it takes 6 - 8 hrs for the henna dye to penetrate all available layers of dead skin cells. Don't pick off your henna paste early!
Oxidation: the stain will always be light at first; it darkens over 2 days with oxidation.
Personal body chemistry: hormones, pH levels temperature all affect stain.