Hexavalent chromium treatment agent and leather or leather article produced using the same

A leather or leather article comprising a hexavalent chromium-reducing compound capable of reducing hexavalent chromium into trivalent chromium, and a nonionic surfactant,

• wherein the hexavalent chromium-reducing compound comprises:
• an organic compound (A) that has a structure represented by the following formula (1) and capable of acting to reduce hexavalent chromium into trivalent chromium, that has a hydroxyphenyl group, and that has no aldehyde groups and no carboxyl groups, and
• an organic compound (B) that has a structure represented by the following formula (1) and capable of acting to reduce hexavalent chromium into trivalent chromium and that has no hydroxyphenyl groups, no aldehyde groups, and no carboxyl groups,
• wherein R1, R2, R3, R4, and R5 are each independently a substituent composed of C, H, O, and R1 or R2 and R3, R4, or R5 may be linked together to form a ring.

A method for producing a leather or leather article, comprising treating a leather or leather article with a hexavalent chromium treatment agent comprising a hexavalent chromium-reducing compound capable of reducing hexavalent chromium into trivalent chromium, a nonionic surfactant, and an aqueous solvent,

• wherein the hexavalent chromium-reducing compound comprises:
• an organic compound (A) that has a structure represented by the following formula (1) and capable of acting to reduce hexavalent chromium into trivalent chromium, that has a hydroxyphenyl group, and that has no aldehyde groups and no carboxyl groups, and
• an organic compound (B) that has a structure represented by the following formula (1) and capable of acting to reduce hexavalent chromium into trivalent chromium and that has no hydroxyphenyl groups, no aldehyde groups, and no carboxyl groups,
• wherein R1, R2, R3, R4, and R5 are each independently a substituent composed of C, H, O, and R1 or R2 and R3, R4, or R5 may be linked together to form a ring.