Patent ID: 6518003
Filing Date: 2003-02-11
Classification: G03C

Abstract:
A three-part color developing kit comprising:(I) a first concentrated aqueous solution having a pH of from about 11 to about 13.5 and comprising: (a) at least 0.25 mol/l of sulfite ions, (b) at least 2.5Ã—10âˆ’5 mol/l of iodide ions, (c) at least 0.05 mol/l of bromide ions, and (d) at least 0.5 mol/l of a buffer having a pKa of from about 11 to about 13.5, (II) a second concentrated aqueous solution having a pH of from about 3 to about 6 and comprising: (a) at least 1 g/l of a vinyl pyrrolidone polymer, and (b) at least 0.05 mol/l of an organic antioxidant, and (III) a third concentrated aqueous solution having a pH of from about 1 to about 3 and comprising: (a) at least 0.05 mol/l of a color developing agent, and (b) at least 0.005 mol/l of sulfite ions.