Ciba-Geigy Corporation

Ciba-Geigy Ag

James H Astbury

James K Skelly

Arnold Hofer

Rene Graf

Barrie Broadbent

A pressure-sensitive recording material which contains, on at least one support, at least one color former and one inorganic developer therefor applied in the form of coatings, said coatings additionally containing a urea-formaldehyde condensate with a BET specific surface area of 3 to 30 m.sup.2 /g.

Pressure-sensitive recording material

An image producing system is provided, wherein an activator composition e.g. made up as a crayon or pencil, when contacted with paper substrate containing an azo color former yields an image by color change.

Image producing system

An image producing system is provided which comprises paper impregnated or coated with a dispersion of a color former in a mixture of water and a water-miscible organic solvent for the color former; and a carrier material impregnated with a solution of an organic acid in a weakly volatile high boiling solvent.

Chemical composition

An image producing system is provided which comprises a substrate having printed on at least a portion of a surface thereof an ink containing a neutral or substantially neutral ink vehicle, a liquid organic base and a color former, and which system also comprises a carrier material impregnated with a solutions of an organic acid in a weakly volatile high boiling solvent.

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Stockport, United Kingdom

James H Astbury