what ink should i use for a whit tattoo?

i have read alot in to white tattoo and want to make sure i am doing everything in my power to in sure that it sticks well. Everything that i have read said that i have to used a certine kind of ink. A very high quality thick white not a mixing white. does anyone know what this would be called. Also what brand would be best so that i may buy it to bring to the shop. Thank you.