Abstract: s-Triazine compounds which contain in their molecule at least one sterically hindered phenol group and at least one polyalkylpiperidine group are effective optical stabilizers for photographic dyes and precursors thereof.

Abstract: The invention relates to novel reactive dyes of the formula ##STR1## wherein Z is --NH.sub.2, C.sub.1 -C.sub.6 alkylamino, N,N--di(C.sub.1 -C.sub.6)alkylamino, cyclohexylamino, N--(C.sub.1 -C.sub.6)alkyl-N-cyclohexylamino, N,N-dicyclohexylamino, phenyl(C.sub.1 -C.sub.2)alkylamino, N--(C.sub.2 -C.sub.4)alkyl-N-phenylamino, naphthylamino, a heterocyclic radical which is bound through an amino group and which may contain further fused carbocyclic rings, or a radical which is bound through the nitrogen atom of an N-heterocyclic ring and which may contain further hetero-atoms, and wherein the alkyl and cyclohexyl moieties, phenyl and naphthyl rings and heterocyclic radicals may be further substituted, and one Y is hydrogen and the other is sulfo. Strong red dyeings and prints are obtained with these dyes on cellulose fibres.

Abstract: A photochromic assembly is produced by coating onto a self-supporting flexible plastics material a polymer latex comprising from 10 to 40% by weight to the total solids of the latex photochromic glass beads from 0.05 .mu.m to 50 .mu.m in size.

Abstract: A photographic silver dye bleach material which contains a compound of the formula ##STR1## in which R is a substituted alkyl, R.sub.1 is substituted or unsubstituted alkyl, p is 1 or 2, q is 0 or 1, p+q having to be 1 or 2, and n is 1 to 20, or a salt of this compound.The benzoquinones used deactivate bleach catalysts which diffuse beyond the silver image area produced by development of the exposed material. The silver dye bleach material containing these compounds is therefore distinguished by high contrast, high sharpness and good color reproduction.

Abstract: Photographic materials which comprise, on a base, at least one layer containing an azo dyestuff of the formula ##STR1## in which R.sub.1 is hydrogen, an alkylsulfone, halogen, cyano or nitro, R.sub.2 is hydrogen, halogen, cyano or nitro, R.sub.3 is hydrogen, alkyl, halogen, cyano or nitro, B.sub.1 is an aromatic ring system, K.sub.1 is an aromatic amine and m.sub.1 is 1 or 2.

Abstract: Recording material for color photography, which contains, in at least one silver halide emulsion layer, at least one yellow coupler of the formula ##STR1## in which R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are alkyl, cycloalkyl or aryl, X.sub.1, X.sub.2, X.sub.3 and X.sub.4 are radicals detachable during the coupling reaction and Y.sub.1 and Y.sub.2 are halogen, alkyl, alkoxy, alkylmercapto, --CN, --COOH, carbalkoxy, --NH.sub.2, --NHR.sub.5, --NR.sub.5 R.sub.6 or --NHCOR.sub.5, in which R.sub.5 and R.sub.6 are alkyl or phenyl, Z is a divalent bridge member and r is 1 or 2.Photographic colored images with excellent spectral absorption characteristics and good resistance to light, heat and moisture are obtained by exposing the recording material image-wise and developing.

Abstract: In a process for the production of photographic images by the silver dye bleach process, a photograph material is used which, on a base, comprises at least one silver halide-free gelatin layer, which contains a diffusion-resistant bleachable image dye, the gelatin/dye ratio being at most 10:1, and a silver halide emulsion layer which is arranged directly on top of the former layer on the side facing the light source and is free of image dye, and the exposed material is processed in a dye and silver bleach bath which contains a combination of oxidizing agents of the formula (1a) with bleach catalysts of the formulae (2a) and (3), or of the oxidizing agent of the formula (1b) with bleach catalysts of the formula (2b).

Abstract: A liquid spray apparatus comprises a pneumatic drive and automatic speed regulating device. To this end, a vane wheel which can be acted upon by an air stream is mounted axially displaceably on a shaft. The vane wheel is in contact with regulating elements which are moved radially outwardly at increasing speed by the influence of centrifugal forces. In doing so the regulating elements act upon the vane wheel in a manner such that it is displaced at least partially out of the range of the air stream.

Abstract: A fire retardant composition for rigid polyurethanes or polyisocyanurates comprises dimethyl methyl phosphonate, diethyl ethyl phosphonate or a mixture thereof and a triaryl phosphate, a trialkyl phosphate or an alkyl/aryl phosphate in a ratio by weight of 5:95 to 95:5. The composition may also contain a halogen-containing flame retardant compound.

Abstract: Compounds of the formula ##STR1## wherein L is a direct bond or consists of a chain of carbon atoms or of a divalent ring system, R.sub.1 to R.sub.4 are hydrogen or alkyl, R.sub.5 or R.sub.6 are hydrogen, alkyl or aryl, or R.sub.5 together with R.sub.6 complete a ring system, and R.sub.7 is hydrogen or a group of the formula ##STR2## wherein L, R.sub.5 and R.sub.6 are as defined. These compounds are useful developing agents for activation processing.

Abstract: Aerial spraying apparatus includes two sets of nozzles located at spaced locations on an aircraft. Each nozzle has an electrode associated with it to induce a charge on the cloud of droplets issuing from the nozzle. A high potential is maintained on each electrode by a power pack that induces an equal and opposite potential on the electrodes of each set. By virtue of the opposed polarity of the electrodes, the aircraft is maintained at a neutral potential. To prevent a potential being imposed due to spray being deposited on the electrodes, a pair of corona needles are provided to establish a leakage current and maintain the electrodes at the required potential. This prevents the system becoming imbalanced and a potential being established on the aircraft.

Abstract: The invention describes a process for the production of benzanthrone by reacting anthraquinone with glycerol and/or acrolein, using anthrone as reducing agent.Benzanthrone is an important intermediate for dyes and is used in particular for the preparation of vat dyes.

Abstract: Compounds which contain in their molecule both a hydroquinone monoether or resorcinol monoether radical and a polyalkylpiperidine radical are effective stabilizers for photographic dyes and their intermediates. In particular, they act as stabilizers against damage by light.

Abstract: The process and the apparatus according to the invention are used to produce a suspension of cyanuric chloride in water, or to react cyanuric chloride with ammonia or with amines. It is possible to produce cyanuric chloride suspensions in water which have a mean particle size of below 20 .mu.m, and a concentration of higher than 20% by weight of cyanuric chloride.

Abstract: A daylight enlarger of the enclosed image-framing area type wherein the image framing area is enclosed by solid curtain walls having at least one light-tight arm-hole therein and wherein part of one of the walls encompasses in a light-tight manner a removable actinic light opaque processing dish having a lid which when the dish is present in the wall can be opened to enable print material to be placed therein and which can be closed from inside the enclosed image framing area.

Abstract: There is disclosed a process for isolating 2-naphthylamine-3,6,8-trisulfonic acid in the form of the alkali or ammonium salt from the sulfonation mixture resulting from the sulfonation of the corresponding naphthylaminemonosulfonic or -disulfonic acid in oleum, which process comprises starting from a sulfonation mixture which contains the naphthylaminetrisulfonic acid in the form of the monopotassium or monoammonium salt, charging said mixture into water or dilute sulfuric acid such that the concentration of the sulfuric acid in the dilute solution or suspension of the sulfonation mixture is 30 to 77% by weight, simultaneously allowing the temperature to rise to 90.degree. to 125.degree. C., subsequently slowly cooling said solution or suspension to a temperature below 40.degree. C., during said cooling adding at least 0.1% by weight, based on naphthylaminetrisulfonic acid, of a dispersant, and isolating the precipitated monopotassium or monoammonium salt of 2-naphthylamine-3,6,8-trisulfonic acid.

Abstract: The invention relates to a process for the preparation of monoaminoanthraquinones of the formula ##STR1## wherein R is a non-ionic substituent and n is 0, 1, 2 or 3, by reduction of corresponding mononitroanthraquinones, which process comprises reacting said mononitroanthraquinones with formaldehyde, in the presence of a base and a catalyst, in an aqueous alcoholic solution.

Abstract: New hydroquinone ether compounds of formula I are described: ##STR1## wherein p is 1 or 2 and q is 0 or 1, provided that p+q is 1 or 2, R is a residue of formula II ##STR2## and R.sub.o, R.sub.oo, R.sub.1, R.sub.2, R.sub.3, Q, n and k are as defined in the specification.The new compounds are useful e.g. as stabilizers in photographic material.

Abstract: The rotating shaft is sealingly mounted in a wall of the vessel by a liquid-tight lip seal. In order to avoid undesired depositions on the seal the latter is made of electroconductive material and connected to the anode of a source of electricity the cathode of which is connected to a counter-electrode within the vessel.

Abstract: The processing time of exposed photographic silver dye bleach materials is shortened by using a bleach preparation which contains a strong acid, a water-soluble iodide, a water-soluble organic nitro compound, an anti-oxidizing agent, a bleach catalyst, an organic photographic developing agent and/or a benzotriazole derivate.