Abstract: An improvement of an information recording medium comprising a substrate and a recording layer provided thereon which is capable of writing information with a laser beam is disclosed. The improvement comprises the recording layer comprising a metal layer containing Se and Te and a TeO.sub.x layer (1.ltoreq.x.ltoreq.2) deposited on the metal layer.

Abstract: A silver halide photographic material which comprises a support having a subbing layer containing an aqueous polymer latex represented by the following formula (I), which has a cross linked structure: ##STR1## wherein A represents an ethylenic unsaturated monomer unit; R.sub.1 represents a hydrogen atom or a lower alkyl group having from 1 to 6 carbon atoms; L represents a divalent group having from 1 to 12 carbon atoms; R.sub.2, R.sub.3 and R.sub.4, which may be the same or different, each represents an alkyl group, an aralkyl group or a hydrogen atom; Q represents nitrogen or phosphorus; X-represents an anion other than iodine ion; and B represents a structural unit in which copolymerizable monomers having at least two ethylenic unsaturated groups have been copolymerized: x is selected to constituted from 0 to 90 mol%; y is selected to constitute from 10 to 99.9 mol%; z is selected to constitute from 0.1 to 50 mol%; and R.sub.2, R.sub.3 and R.sub.

Abstract: In a color printer provided with an optical path into which a negative is brought and an image of the negative is focused on a photographic paper to make a color print, an exposure control device is provided. The exposure control device has a plurality of neutral density filters which can be put into the optical path of the color printer independently of or in combination with each other. The combination of the plurality of neutral density filters is selected to stepwisely change the total density of the combined neutral density filters according to the density of the negative brought into the optical path of the color printer. The plurality of neutral density filters are gray filters and have different densities.

Abstract: A method of hardening gelatin which comprises adding thereto a compound of the following general formula (I): ##STR1## in which Y.sub.1 is CH.sub.2 =CH--, ClCH.sub.2 --CH.sub.2 --, BrCH.sub.2 --CH.sub.2 --, CH.sub.3 COO--CH.sub.2 CH.sub.2 -- or ClCH.sub.2 COO--CH.sub.2 CH.sub.2 --, R.sub.1 and R.sub.2 are H or CH.sub.3, but both of them are not CH.sub.3 at the same time, and A is one of the following groups: ##STR2## in which both R.sub.3 and R.sub.4 were acyl groups or at least one of them is an acyl group other than when R.sub.3 and R.sub.4 form a benzotriazole ring, and when one of R.sub.3 and R.sub.4 is an acyl group, the other is H or an alkyl group containing at most 4 carbon atoms; and wherein in any case, R.sub.3 and R.sub.4 may form a saturated or unsaturated carbocyclic or heterocyclic ring in combination with the nitrogen atom to which they are attached; R.sub.5, R.sub.6 and R.sub.