Why Soul Tattoo ?

Is it really better than henna?
Soul Tattoo creates a blue/black tattoo, realistic yet temporary.
Henna by itself is not dangerous and will produce a red/brown temporary tattoo.
On the other hand, black henna contains additives to change its color and produce realistic temporary tattoos.
This may sound good in theory, but the added chemicals
They are tough and can cause blisters and permanent scarring.