Abstract: A printer suitable for color printing which uses an ink jet printhead in which the marking fluid contains no dye so that a latent image of the desired print pattern is produced in the form of moistened spots directly on the print medium. The latent image is then developed by applying some colored powder to the print medium, and the developed image is then fixed to the print medium to produce a visible image of the desired print pattern.

Abstract: A substantially aqueous composition for drop on demand ink jet printing comprising a fluid vehicle with greater than 50% by weight water, a water soluble dye in the range of 1-10% by weight, a lower alkylene glycol plasticizer in the range of concentration of 1-20% by weight, and in the range of 1-10% by weight, a water soluble additive which is a low molecular weight heterocyclic, bifunctional monomer or dimer in which the two functional groups are either two imide groups, or a hydantoin bearing a carboxylic acid group, with both the imide groups and the amide groups being capped with hydroxyalkylene units.