Dye coupler

Abstract: Hair colouring compositions which comprise: A) non-nitrogenous chelating agents from the groupconsisting of polyphosphate; phosphonates;hydroxycarboxylates; polyacrylates; zeolite; and mixtures thereof; B) an oxidative dye primary intermediate; and C) an oxidative dye coupler; D) and waterare described.The present invention also relates to a method for colouring hair which comprises contracting said hair with a haircolouring composition as described above.

Abstract: In a new process for generating a coloured picture from a dye coupler contg. silver halogenide material the development takes place in presence of a cpd. of formula (I), where R1, R2 and C form a system able to couple at the C-atom; NLG = 'non-leaving group' which cannot be hydrolytically cleaved; and DEV = developer rest. Also claimed is a silver halogenide colour photographic material contg. (I). Pref. cpd. (I) can either be present in the developer bath or in the silver halogenide material. The concn. of (I) in the silver halogenide emulsion layer is pref. 5-100 mmole/m2, esp. 10-50 mmole/m2. The colour photographic silver halogenide material comprises: (a) >= 1 dye coupler; (b) >= 1 silver halogenide emulsion layer, >= 1 of which contains a cpd. (I).

Abstract: 1, 157, 506. Coupler incorporated silver halide materials. ILFORD Ltd. Sept. 8, 1966 [Sept. 10, 1965], No.38751/65. Heading G2C. [Also in Division C4] Photographic material suitable for forming reversal transfer images in colour comprises, in at least one silver halide emulsion layer or an adjacent layer, a cyan dye coupler of formula wherein n is 2-8 when X is H and from 3-8 when X is OH and R is a group having a free p-position to a phenolic hydroxyl group of formula selected from

Abstract: A method of processing an imagewise exposed color photographic film, said film having at least three light-sensitive units which have their individual sensitivities in different wavelength regions, each of the units comprising at least one light sensitive silver halide emulsion and image dye coupler, which method comprises contacting the imagewise exposed color photographic film with an aqueous solution containing a non-blocked developing agent, at a temperature of between 30 to 60° C.; and wherein said film further comprises an incorporated reducing agent, at least one organic silver salt and an amido compound wherein the reducing agent is substantially unreactive in the aqueous color development step described above, but wherein color development of the same imagewise exposed film is capable of being alternatively obtained, without any externally applied developing agent, by heating said film to a temperature above about 80° C. essentially in the absence of aqueous solutions, such that the incorporated reducing agent reacts to form dye by reacting with the image dye couplers; with the proviso that the amido compound effectively reduces contrast when the film is heated above 80° C. but does not substantially reduce contrast when the film is processed by contacting the imagewise exposed color photographic film with a non-blocked developing agent under aqueous conditions, at a temperature of between 30 to 60° C.