| http://www.w3.org/ns/prov#value | - m salts; dyestuffs formed by the reduction of 1,1???-dimethyl-4,4???-bipyridinium salts and the like; and the like. [0098] The hydrogen donor is a compound such as phenol which forms a quinone dyestuff when it is condensed with 4-amino-1,2-dihydro-1,5-dimethyl-2-phenyl-3H-pyrazol-3-one(4-AA) or 3-methyl-2-benzothiazoline hydrazone by the function of peroxidase in the presence of hydrogen peroxide.
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