Dye mixture and ink containing the same

A dye mixture comprising a plurality of different dyes represented by the following formula (I):

• wherein M represents a hydrogen atom, a metal atom or an oxide, hydroxide or halide thereof;
• Pc represents a (k+l+m+n)-valent phthalocyanine nucleus represented by formula (II);
• X1, X2, X3 and X4 each independently represents a substituent selected from the group consisting of —SO—R1, —SO2—R1, —SO2NR2R3, —CONR2R3, —CO2—R1 and CO—R1 and each of four benzene rings {A, B, C and D in formula (II)} of the phthalocyanine nucleus has at its β-position at least one substituent of X1, X2, X3 and X4, provided that the case where X1, X2, X3 and X4 all are the same is excluded and at least one of X1, X2, X3 and X4 has an ionic hydrophilic group as a substituent;
• R1 represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group or a substituted or unsubstituted heterocyclic group;
• R2 represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group or a substituted or unsubstituted heterocyclic group;
• R3 represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group or a substituted or unsubstituted heterocyclic group;
• k, l, m and n represent an integer of 0<k<8, an integer of 0<l<8, an integer of 0≦m<8 and an integer of 0≦n<8, provided that k and/or l and/or m and/or n each independently represents a number satisfying 4≦k+l+m+n≦8;
• and Y1, Y2, Y3, Y4, Y5, Y6, Y7 and Y8 each independently represents a hydrogen atom and/or a monovalent substituent and these monovalent substituents each may further have a substituent.