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.

Can I get it in black or another colour?

NO.
"Black Henna" does not exist.  The black comes from a very dangerous concentrated chemical called Para-phenylendiamine or PPD.  It is very dangerous to your health. So toxic that it is illegal to use on the skin in Canada.
See the link "henna is not black" for more details.