| abstract |
COLORLESS MAGENTA FORMING COLOR COUPLERS OF THE 2PYRAZOLIN-5-ONE TYPE HAVING FORMULA: 1-(AR-CH2-),3-(R-CO-HN-)-2-PYRAZOLIN-5-ONE WHEREIN: AR REPRESENTS AN ARYL GROUP, AND R REPRESENTS AN ALKYL RADICAL, AN ARYL RADICAL, AN ARALKYL RADICAL, AN ALKOXY RADICAL, IN ARYLOXY RADICAL, AN ARALKYLOXY RADICAL, AN ALKYLAMINO RADICAL AN ARYLAMINO RADICAL OR AN ANALKYLAMINO RADICAL ARE DESCRIBED. THESE COLOR COUPLERS HAVE IMPROVED STABILITY WHEN STORED IN HUMID AND WARM ATMOSPHERES AND THE WHITE IMAGE AREAS DO NOT UNDERGO DISCOLORATION. |