The present invention provides a method of manufacturing a reactive composition: (a) dissolving 2-[(4-aminophenyl)sulfonyl]ethanesulfonic acid in water to form a solution; (b) introducing excess nitrite or excess nitrous acid and the solution into an acid solution to form a diazonium salt; (c) adding 4-amino-5-hydroxy-2,7-naphthalenedisulfonic acid to react with the diazonium salt; (d) adding 7-acetamido-4-hydroxy-2-naphthalenesulfonic acid to react with the diazonium salt; (e) adding a first alkaline substance to adjust a pH value; (f) adding a second alkaline substance to adjust the pH value; (g) adding a third alkaline substance to control the pH value; (h) adding an acidic substance to adjust the pH value; and (i) adding an additive agent to obtain the reactive composition, wherein the additive agent is acetic acid, sodium hydroxide, acetate, sulfonic acid buffering agent, or a combination thereof.

The present invention provides a method of manufacturing a reactive composition: (a) dissolving 2-[(4-aminophenyl)sulfonyl]ethanesulfonic acid in water to form a solution; (b) introducing excess nitrite or excess nitrous acid and the solution into an acid solution to form a diazonium salt; (c) adding 4-amino-5-hydroxy-2,7-naphthalenedisulfonic acid to react with the diazonium salt; (d) adding 7-acetamido-4-hydroxy-2-naphthalenesulfonic acid to react with the diazonium salt; (e) adding a first alkaline substance to adjust a pH value; (f) adding a second alkaline substance to adjust the pH value; (g) adding a third alkaline substance to control the pH value; (h) adding an acidic substance to adjust the pH value; and (i) adding an additive agent to obtain the reactive composition, wherein the additive agent is acetic acid, sodium hydroxide, acetate, sulfonic acid buffering agent, or a combination thereof.

An azo iron complex dye which does not contain harmful heavy metals, exhibits sufficient solubility in organic solvents for practical use, and exhibits an excellent black color. The azo iron complex dye contains a disazo-monoazo iron complex represented by the following chemical formula (1)

##STR00001## (in the chemical formula (1), R.sup.1 and R.sup.2 are each independently a straight or branched alkyl group having 3-10 carbon atoms, R.sup.3 is an electron-withdrawing group, R.sup.4 is a straight or branched alkyl group having 1-5 carbon atoms or a straight or branched alkoxy group having 1-5 carbon atoms, R.sup.5 is a nitro group, a sulfonamide group or a halogen atom, R.sup.6 is a hydrogen atom, a straight or branched alkyl group having 1-8 carbon atoms, a nitro group or a halogen atom, R.sup.7 is a hydrogen atom or a straight or branched alkyl group having 3-12 carbon atoms, and A.sup.+ is a monovalent cation).

A dye mixture, comprising at least one blue dyeing dye of the formula (1), wherein Q.sub.1 represents a bivalent radical of formula (4a), (4b) or (4c), wherein X.sub.1 denotes chlorine or fluorine, R.sub.1 is hydrogen or C.sub.1-C.sub.8 alkyl, R.sub.2 is hydrogen, C.sub.1-C.sub.8alkyl, C.sub.1-C.sub.4alkoxy or sulfo, Y.sub.1 is vinyl or a radical CH.sub.2CH.sub.2U and U is a leaving group removable under alkaline conditions, R.sub.3 is hydrogen or C.sub.1-C.sub.8alkyl that is unsubstituted or substituted by hydroxy, sulfo, sulfato, cyano, carboxy, C.sub.1-C.sub.4alkoxy or phenyl, r and s are each independently of the other the number 0 or 1, and t is the number 0, 1 or 2, and the sum of r, s and t is 2 or 3 and at least one yellow or red dyeing reactive dye is suitable especially for the dichromatic or trichromatic dyeing or printing of natural or synthetic polyamide fibre materials and yield dyeings or prints having good reproducibility and good all-round fastness properties. ##STR00001##

An azo iron complex dye which does not contain harmful heavy metals, exhibits sufficient solubility in organic solvents for practical use, and exhibits an excellent black color. The azo iron complex dye contains a disazo-monoazo iron complex represented by the following chemical formula (1) ##STR00001##
(in the chemical formula (1), R.sup.1 and R.sup.2 are each independently a straight or branched alkyl group having 3-10 carbon atoms, R.sup.3 is an electron-withdrawing group, R.sup.4 is a straight or branched alkyl group having 1-5 carbon atoms or a straight or branched alkoxy group having 1-5 carbon atoms, R.sup.5 is a nitro group, a sulfonamide group or a halogen atom, R.sup.6 is a hydrogen atom, a straight or branched alkyl group having 1-8 carbon atoms, a nitro group or a halogen atom, R.sup.7 is a hydrogen atom or a straight or branched alkyl group having 3-12 carbon atoms, and A.sup.+ is a monovalent cation).