Patent ID: 7179885

Claim:
A silver halide emulsion containing a nucleation peptiser, said nucleation peptiser being a polypeptide comprising: at least one region A(n) having a maximum length of 100 amino acids, said region A(n) either (i) being delimited by the extreme two of at least two silver-binding amino acids selected from histidine, lysine and arginine, or (ii) being defined by the maximum stretch of amino acids having a polarity corresponding to an average transfer free energy ΔF equal to or higher than +1.0 kcal/mol, said maximum stretch containing at least 9 amino acids; and at least one region B(n) comprising at least 50 amino acids and having a polarity corresponding to an average transfer free energy ΔF equal to or lower than −1.0 kcal/mol and not containing histidine and, if lysine or arginine is among the silver-binding amino acids in region A(n), not containing lysine or arginine; the polypeptide not containing methionine or cysteine.