Abstract: Time and temperature integrating devices for providing a visually observable indication of cumulative thermal exposure are disclosed comprising (a) a substrate having thereon a thermally sensitive image-forming area comprising a combination of (i) an organic silver salt oxidizing agent and (ii) a reducing agent for the organic silver salt oxidizing agent, and (b) indicating indicia in association with the image forming area for indicating when the device has been exposed to a predetermined cumulative thermal exposure. In accordance with further embodiments of the invention, a process of applying such a device to a perishable product, and a perishable product having such a device applied directly thereto or to packaging thereof, are also disclosed. Time-temperature indicators in accordance with the invention undergo readily detectable changes can be easily optimized to match various rates of time-temperature dependent cumulative changes desired to be monitored for various products.

Abstract: A thermographic imaging element comprises:(a) a support;(b) an imaging layer comprising:(i) a silver salt;(ii) a first reducing agent which has high activity with an activation energy of less than 10 Joules/sq.cm.; and(iii) a second reducing agent which has low activity with an activation energy of greater than or equal to 10 Joules/sq.cm.

Abstract: 1. A thermographic imaging element comprising: (a) a support; and(b) an imaging layer comprising:(i) an oxidizing agent;(ii) a first reducing agent; and(iii) a second reducing agent comprising a boron compound containing at least one boron-hydrogen bond.

Abstract: A thermographic imaging element comprises:(a) a support;(b) an imaging layer comprising:(i) an oxidizing agent;(ii) a first reducing agent which has high activity with an activation energy of less than 10 Joules/sq.cm.;(iii) a second reducing agent which has low activity with an activation energy of greater than or equal to 10 Joules/sq. cm.; and(iv) a third reducing agent comprising a boron compound containing at least one boron-hydrogen bond.

Abstract: A thermographic imaging element comprises:(a) a support;(b) an imaging layer comprising:(i) a silver salt;(ii) a first reducing agent which has high activity with an activation energy of less than 10 Joules/sq.cm.;(iii) a second reducing agent which has low activity with an activation energy of greater than or equal to 10 Joules/sq. cm.; and(iv) a third reducing agent comprising a silicon compound containing at least one silicon-hydrogen bond.

Abstract: A thermographic imaging element comprising:(a) a support; and(b) an imaging layer comprising:(i) an oxidizing agent;(ii) a first reducing agent; and(iii) a second reducing agent comprising a silicon compound containing at least one silicon-hydrogen bond.

Abstract: Improved radiation-sensitive elements comprise a support; a radiation-sensitive layer; and an auxiliary layer comprising an absorbing amount of an anionic dye, and a synthetic amphoteric polymer comprising: acrylic acid and N,N-dialkylaminoethyl methacrylate; wherein alkyl=methyl or ethyl, the molar ratio of (a):(b).ltoreq.1:1; said polymer has an isoelectric point of 7.0-11.2; and said polymer is present in said auxiliary layer in an amount sufficient to mordant said anionic dye.

Abstract: Compounds as defined having a 1-phenylindole nucleus substituted in the 2-position with a 3-pyridyl group. Such compounds are useful in the preparation of cyanine dyes which can be used to sensitize silver halide emulsions for fogged direct-positive films.

Abstract: A fogged direct positive photographic silver halide emulsion containing a sensitizing amount of at least one cyanine dye defined above, e.g., cyanine dye containing a 1-phenylindole nucleus substituted in the 2-position with the 3-pyridyl group. The said cyanine dye is also covered. The dye useful in sensitizing the silver halide emulsion useful for fogged direct-positive films.

Abstract: A fogged direct positive photographic silver halide emulsion containing a sensitizing amount of at least one cyanine dye defined above, e.g., cyanine dye containing a 1-phenylindole nucleus substituted in the 2-position with the 3-pyridyl group. The said cyanine dye is also covered. The dye useful in sensitizing the silver halide emulsion useful for fogged direct-positive films.