Henna Tattoos To Buy

Where can i buy a black Henna tattoo set?

One day i went to mexico for a vacation and they had these guys on the beaches that give Non permanent tattoos.
Im pretty sure its henna because it lasts about 30 days.
They used this special tool too. Like the stuff you would use to squeeze in filling for a cake or whatever but smaller.
ITS BLACK!! Most hennas a very nasty brown/green colour.
Help me out plz!

the guy who said its horrible stuff is Absolutely right black henna ink is not natural henna ink it contains hair dye that will in return give u a chemical burn that could last forever if u want henna ink get brown or red as for these are natural henna ink colors