3/6/2017 3:29:36 PM: Okay, after talking with a number of subs/slaves who have tattoos (and think it's a great idea to become a 'coloring book' without asking important questions first), I've decided to offer the following information. Consider it something of a 'Public Service' announcement: tattoo ink can: 'contain titanium dioxide, lead, chromium, nickel, iron oxides, ash, carbon black, and other ingredients. Some of the pigments are industrial grade and used as automobile paint.'From another source: 'Manufacturers are not required to reveal their ingredients or conduct trials, and recipes may be proprietary. Professional inks may be made from iron oxides (rust), metal salts, plastics.[6] Homemade or traditional tattoo inks may be made from pen ink, soot, dirt, blood, or other ingredients.[3][7] Heavy metals used for colors include mercury (red); lead (yellow, green, white); cadmium (red, orange, yellow); nickel (black); zinc (yellow, white); chromium (green); cobalt (blue); aluminium (green, violet); titanium (white); copper (blue, green); iron (brown, red, black); and barium (white). Metal oxides used include ferrocyanide and ferricyanide (yellow, red, green, blue). Organic chemicals used include azo-chemicals (orange, brown, yellow, green, violet) and naptha-derived chemicals (red). Carbon (soot or ash) is also used for black. Other elements used as pigments include antimony, arsenic, beryllium, calcium, lithium, selenium, and sulphur.[5][7] Tattoo ink manufacturers typically blend the heavy metal pigments and/or use lightening agents (such as lead or titanium) to reduce production costs.''