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Technically, inorganic pigment materials have no expiration. The carrier fluid will eventually evaporate in most ink-bottles. The plastic of the bottle and seals will break down enough in time to allow the evaporated fluid to escape. In theory, adding more carrier fluid to a bottle of ink that has dried out would result in usable dispersed ink. ALL Products in this category are only sold for training purposes and should under no circumstances be used on any customer.