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Food coloring, or color additive, is any dye, pigment or substance that imparts color when it is added to food or drink. They come in many forms consisting of liquids, powders, gels, and pastes. Food coloring is used both in commercial food production and in domestic cooking. Due to its safety and general availability, food coloring is also used in a variety of non-food applications including cosmetics, pharmaceuticals, home craft projects, and medical devices.

Titanium dioxide is is called titanium white, Pigment White , When used as a food coloring, it has A number E171. it is used in milk and cheeses.
Iron oxide yellow is used in marine paints, pigment in rubber and plastic products and in polishing compounds. It is also used in resistors and semiconductors and cosmetics and drugs.
Iron oxides red is widespread in nature. When used as a food coloring and pharma , it has E number E172.Iron oxide has many uses including pigments, ceramics, welding (thermite), along with a wide range of other uses. As with all chemicals, iron oxide should be handled with care.
Iron oxides black is widespread in nature, play an important role in many geological and biological processes, and are widely used by humans example as oxide. Iron oxides are widely used as inexpensive, durable pigments in paints, coatings and colored concretes. Colors commonly available are in the "earthy" . When used as a food coloring and pharma , it has E number E172.