Minnesota Mining and Manufacturing Company

Marco Beruto

Piero Ramello

Antonio Luzzi

Marco Bucci

Renzo Torterolo

Pierfiore Malfatto

A radiographic assembly comprising: a radiographic element which comprises a support and a front and back pair of silver halide emulsion layers coated on the opposite sides of the support, and a front and back pair of intensifying screens adjacent said front and back emulsion layers, respectively, wherein at least one of said silver halide emulsion layers shows a swelling index lower than 140% and a melting time of from 45 to 120 minutes, and the contrast difference between said pair of silver halide emulsion layers is at least 0.5, wherein the X-ray stimulated light emission difference between said pair of intensifying screens is at least 0.6 IogE, and wherein the average imagewise cross-over of said radiographic element is lower than 5% at optical density of from 0.5 to 1.75 and in the range of from 5 to 15% at optical density of from 1.75 to 3.25, said imagewise cross-over being measured according to the formula described in the specificaton.

Radiographic assembly having reduced image-wise cross-over and super

A photographic material for tanning development which comprises a photographic support base, at least one tannable binder material, at least one silver halide emulsion and at least one pigment, said material including a 3-pyrazolidone compound and at least two different 1,4-dihydroxybenzene compounds, the first of which is chosen within the group of those having a standard tanning development time (STDT) of one fourth to twice the hydroquinone STDT (STDTHy) and the second of which is chosen within the group of those having a STDT of one fourth to fifteen times the STDTHy. Most preferably, the above photographic material includes hydroquinone in addition to the 3-pyrazolidone compound and the two 1,4-dihydroxybenzene compounds, wherein the first 1,4-dihydroxybenzene compound, other than hydroquinone, is chosen within the group of those having a STDT of one fourth to twice the STDTHy and the second 1,4-dihydroxybenzene compound is chosen within the group of those having a STDT of two to fifteen times the STDTHy. A method to obtain relief images by using the above said photographic material.

Photographic material for tanning development and method for obtaining a

Silver halide photographic elements for tanning development including tanning developers, which can diffuse into the gelatin layer containing them, can be improved if they are associated with non-diffusing hydroquinones. In the case where such tanning developer is hydroquinone or a derivative thereof, said elements include such diffusing hydroquinone associated with a hydroquinone derivative non-diffusing in the gelatin layer containing it. Such non-diffusing hydroquinones preferably are hydroquinones substituted with aliphatic chains containing a total of at least twelve carbon atoms and, more preferably, are dispersed in the layer dissolved in a high-boiling organic solvent.

Gelatin silver halide photographic elements for tanning development

A photographic element for tanning development which comprises a support, a layer of silver halide emulsion in non-hardened gelatin including a tanning developer dispersed therein, and over said emulsion layer, a layer of non-hardened gelatin comprising at least one colored pigment dispersed therein, characterized by the silver in said silver halide emulsion layer being present in a quantity of less than 0.6 g/m.sup.2 with a silver/gelatin ratio of less than 0.4. A method for obtaining a colored relief image in such an element is shown.

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Savona, Italy

Marco Beruto