ACETOACET-O-TOLUIDIDE(AAOT)

N METHYL ANILINE

META PHENYLENE DIAMINE-4-SULPHONIC ACID

BROMAMINE ACID

K ACID

J ACID

H ACID

TOBIAS ACID

MIXED CLEVES ACID

SODIUM NAPHTHIONATE

3,3′-DICHLOROBENZIDINE DIHYDROCHLORIDE（DCB）