What size tattoo needle do you use for coloring tattoos?

A 12 gauge might be referred to as standards, but they have a faster flow of ink which means they are good for shading and coloring even in bigger areas.

0.35mm, diameter. #12 is one of the larger-diameter needle sizes available and the most commonly used size. By comparison, #10, or 0.30mm, is the size tattoo artists most often like to use when doing lining work.