Colours or Colourants are classified as either organic or inorganic depending on their chemistry. Both organic and inorganic colourants are available in dry form or liquid form dispersed in an oil. Almost all organic colourants are synthetic and are available as either water soluble, oil soluble or insoluble (= Lakes) agents in all kinds of shades. Inorganic colourants are composed of insoluble metallic compounds which are either derived from natural sources (e.g. china clay, carbon deposits) or synthesized.