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Ionochromic materials, similar to photochromic, thermochromic and other chromic materials, alter colour in the presence of a factor and reverse to their initial state when the factor is removed. The factor which causes colour change in ionochromic substances are ions. A flow of ions through an ionochromic material results in a reaction/colour change from the material; this material is in many ways similar to electrochromic materials which change colour when electrons flow through them. Electrons, just like anions, carry a negative charge. Both electrochromic and ionochromic substances have their colour change activated by the flow of charged particles. Ionochromic substances are suitable for detection of charged particles; some ionochromic substances can be used as indicators for complexometric titrations.