Abstract: This invention relates to an improvement in a light-sensitive copying material comprising a carrier and a light-sensitive copying layer which contains, as the light-sensitive compound, an o-quinone diazide sulfonic acid ester or an o-quinone diazide sulfonic acid amide, the improvement being that the layer also contains a compound with an aromatic or aliphatic hydroxy group which is capable of forming chelate compounds.

Abstract: The aqueous-alkaline developer solution for radiation-sensitive, positive-working reproduction layers contains silicate and a quaternary ammonium base, such as tetraalkylammonium hydroxide; it may further contain a salt of an organic, optionally substituted, aromatic monocarboxylic acid, for example, a benzoate. This solution is in particular used for developing reproduction layers which contain an o-naphthoquinone diazide as the radiation-sensitive compound and an alkali-soluble resin and which are applied to a support material based on aluminum, which comprises at least one aluminum oxide layer produced by anodic oxidation.

Abstract: This invention relates to an improvement in a light-sensitive copying layer containing an ester or an amide of an o-naphthoquinone diazide sulfonic acid or carboxylic acid together with an organic dyestuff and which changes its color shade upon exposure to light, the improvement comprising that it contains, calculated on its total content of o-naphthoquinone diazide compounds, 10 to 75 per cent by weight of a halide of o-naphthoquinone diazide-4-sulfonic acid and, as the dyestuff, an organic compound capable of salt formation in a quantity of 1 to 50 per cent by weight, calculated on the same basis.