Photographic developer/amplifier compositions
AssigneeEastman Kodak Company
InventorPeter Jeffery Twist
Life of this patent
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Abstract
An aqueous redox amplifier composition comprising a color developing agent, hydrogen peroxide or a compound which provides hydrogen peroxide and hydroxylamine or a salt thereof wherein the concentration ranges are: hydrogen peroxide from 0.5 to 10 ml/l (as 30% w/w solution), hydroxylamine or a salt thereof from 0.25 to 5.5 g/l (as hydroxylamine sulphate), and wherein the pH is in the range from 10.5 to 12.
Claims15
An aqueous redox amplifier composition comprising a colour developing agent, hydrogen peroxide or a compound which provides hydrogen peroxide and hydroxylamine or a salt thereof wherein the concentration ranges are
- hydrogen peroxide from 0.5 to 10 ml/l (as 30% w/w solution),
- hydroxylamine or a salt thereof from 0.25 to 4 g/l (as hydroxylamine sulphate), and
- wherein the pH range is in the range of from 11 to 12, and the ratio of hydrogen peroxide to hydroxylamine compound is from 1.5 to 2.5 (ml/l 30% w/w hydrogen peroxide solution:g/l hydroxylamine compound as hydroxylamine sulphate).
A method for processing an imagewise exposed colour photographic element comprising contacting said element with an aqueous redox amplifier composition comprising colour developing agent, hydrogen peroxide or a compound which provides hydrogen peroxide and hydroxylamine or a salt thereof wherein the concentration ranges are
- hydrogen peroxide from 0.5 to 10 ml/l (as 30% w/w solution),
- hydroxylamine or a salt thereof from 0.25 to 4 g/l (as hydroxylamine sulphate), and
- wherein the pH range is in the range of from 11 to 12 and the ratio of hydrogen peroxide to hydroxylamine compound is from 1.5 to 2.5 (ml/l 30% w/w hydrogen peroxide solution:g/l hydroxylamine compound as hydroxylamine sulphate).
Dependencies are inferred from the claim text.