| abstract |
WHEREIN: A stands for a branched or unbranched alkylene group including alkylene interrupted by one or more hetero atoms such as oxygen, X stands for alkoxycarbonyl comprising in the alkoxy group at most 5 carbon atoms, hydroxyl, sulpho in acid or salt form, cyano, halogen such as chlorine or the group SO2R wherein R stands for alkyl including substituted alkyl or aryl including substituted aryl, R1 stands for hydrogen, alkyl including substituted alkyl, e.g., the group AX, cycloalkyl, allyl, aralkyl including substituted aralkyl, aryl including substituted aryl, EACH OF L1, L2, and L3 stands for methine including substituted methine, e.g., methine substituted by alkyl, aralkyl, aryl and carboxy, M stands for a cation, e.g., a hydrogen cation, a metal cation or an onium cation of inorganic or organic nature such as ammonium and pyridinium, and P STANDS FOR 1, 2, OR 3. Light-screening oxonol dyes are provided for use as filter dyes and anti-halation dyes in photographic non-light-sensitive colloid layers and as screening dyes in photographic lightsensitive emulsion layers which are discharged quickly, completely, and irreversibly in the photographic processing liquids even in the ''''lith''''-type of developers. The novel lightscreening dyes of the invention have the general formula: |