Formazan images by physical development of catalytic metal nuclei image

Claim 2

A process of preparing a formazan dye image comprising forming an image comprising nuclei of one or more metals from Groups VIIIB and/or IB of the periodic table and catalytically reducing a terazolium salt in contact with said nuclei, a reducing agent that does not spontaneously reduce said tetrazolium salt.

Claim 3

A process of preparing a formazan dye image comprising imagewise exposing to electromagnetic radiation a photographic element comprising a photographic layer comprising one or more light sensitive complexes of metals from Groups VIIIB and/or IB of the periodic table to form a latent image of catalytic metal nuclei in said layer and catalytically reducing a tetrazolium salt in contact with said nuclei, a reducing agent that does not spontaneously reduce said tetrazolium salt or said light sensitive complexes.

Claim 4

A process of preparing a formazan dye image comprising imagewise exposing to electromagnetic radiation a photographic element comprising a photographic layer comprising one or more light sensitive complexes of metals from Groups VIIIB and/or IB of the periodic table to form a latent image of catalytic metal nuclei in said layer and catalytically reducing a tetrazolium salt in contact with said nuclei, a reducing agent that does not spontaneously reduce said tetrazolium salt or said light sensitive complexes.

Claim 5

The process of claim 2 wherein the tetrazolium salt and the reducing agent are added together in the form of a physical developer solution for said photographic element element containing said imagewise exposed light sensitive complexes.

Claim 6

The process of claim 2 wherein the light sensitive complex is K 2 [Pd(C 2 O 4 ) 2 ].2H 2 O, the tetrazolium salt is 2,3,5-triphenyl-2H-tetrazolium chloride and the reducing agent is hydrazine.

Claim 7

The process of claim 2 wherein the light sensitive complex has the formula [PdLX]B(C.sub.6 H.sub.5).sub.4 where L is the ligand N,N,N',N'-tetraethyldiethylenetriamine and X is halide, N 3 - , SCN - , SeCN - or BH 3 CN - .

Claim 8

The process of claim 5 wherein the light sensitive complex is [Pd(1,1,7,7-tetraethyldiethylenetriamine) N 3 ]B(C 6 H 5 ) 4 , the tetrazolium salt is 2,3,5-triphenyl-2H-tetrazolium chloride and the reducing agent is dimethylamine borane.

Claim 9

The process of claim 2 wherein the light sensitive complex is exposed to radiation in the UV to visible portion of the electromagnetic spectrum to produce the catalytic nuclei.

Claim 10

The process of claim 2 wherein the light sensitive complex is exposed to electron beam energy to produce the catalytic nuclei.

Claim 11

A photographic element comprising a photosensitive layer comprising one or more light sensitive complexes of metals from group VIIIB and/or IB of the periodic table said complexes being capable of forming catalytic metal nuclei on exposure to electromagnetic radiation, a layer comprising a tetrazolium salt and the layer comprising a reducing agent which does not spontaneously reduce said tetrazolium salt or said light sensitive complexes and being cable of reducing said tetrazolium salt to formazan dye in the presence of said catalytic metal nuclei, said layers being in reactive association.

Claim 12

A photographic element comprising a photosensitive layer comprising one or more light sensitive complexes of metals from group VIIIB and/or IB of the periodic table said complexes being capable of forming catalytic metal nuclei on exposure to electromagnetic radiation, a layer comprising a tetrazolium salt and the layer comprising a reducing agent which does not spontaneously reduce said tetrazolium salt or said light sensitive complexes and being cable of reducing said tetrazolium salt to formazan dye in the presence of said catalytic metal nuclei, said layers being in reactive association.

Claim 13

The photographic element of claim 9 where the light sensitive complex is K 2 Pd(C 2 O 4 ) 2 .2H 2 O.

Claim 14

The photographic element of claim 9 where the tetrazolium salt is 2,3,5-triphenyl-2H tetrazolium chloride.

Claim 15

The photographic element of claim 9 where the reducing agent is hydrazine.

Claim 16

The photographic element of claim 9 where the light sensitive complex is K 2 Pd(C 2 O 4 ) 2 .2H 2 O and the tetrazolium salt is 2,3,5-triphenyl-2H-tetrazolium chloride and the reducing agent is hydrazine.

Claim 17

A photographic element comprising a photosensitive layer comprising one or more light sensitive complexes of metals from Group VIIIB and/or IB of the periodic table said complexes being capable of forming catalytic metal nuclei on exposure, to electromagnetic radiation and a layer comprising a tetrazolium salt said layers being in reactive association.

Claim 18

A photographic element comprising a photosensitive layer comprising one or more light sensitive complexes of metals from Group VIIIB and/or IB of the periodic table said complexes being capable of forming catalytic metal nuclei on exposure, to electromagnetic radiation and a layer comprising a tetrazolium salt said layers being in reactive association.

Claim 19

The photographic element of claim 14 wherein the light sensitive complex is K 2 Pd(C 2 O 4 ) 2 .2H 2 O.

Claim 20

The photographic element of claim 14 wherein the tetrazolium salt is 2,3,5-triphenyl 2H-tetrazolium chloride.

Claim 21

The photographic element of claim 14 wherein the light sensitive complex is K 2 Pd(C 2 O 4 ) 2 .2H 2 O and the tetrazolium salt is 2,3,5-triphenyl-2H-tetrazolium chloride.