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A method of converting metal-containing or metal alloy-containing compounds into a metal or metal alloy by rapidly heating the metal-containing or metal alloy-containing compound to an elevated temperature to instigate conversion and holding the metal-containing or metal alloy-containing compound at

A method of converting metal-containing or metal alloy-containing compounds into a metal or metal alloy by rapidly heating the metal-containing or metal alloy-containing compound to an elevated temperature to instigate conversion and holding the metal-containing or metal alloy-containing compound at the elevated temperature for a time sufficient to effect formation of the metal or metal alloy is an efficient and economical method of producing metals and metal alloys.

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A method of converting metal-containing or metal alloy-containing compounds into a metal or metal alloy by rapidly heating the metal-containing or metal alloy-containing compound to an elevated temperature to instigate conversion and holding the metal-containing or metal alloy-containing compound at

A method of converting metal-containing or metal alloy-containing compounds into a metal or metal alloy by rapidly heating the metal-containing or metal alloy-containing compound to an elevated temperature to instigate conversion and holding the metal-containing or metal alloy-containing compound at the elevated temperature for a time sufficient to effect formation of the metal or metal alloy is an efficient and economical method of producing metals and metal alloys. s, antiseptics, chelating agents, stabilizing agents, antioxidants, plant extracts, crude drugs extracts, vitamins, colorants, perfumes, aerosolizing agents and UV absorbers. 2. A hair dye composition according to claim 1, wherein the compound of formula (1) is selected from the group consisting of the following compounds (a)-(f): 3. The hair dye composition according to claim 1, further comprising one or more direct dyes other than one having said formula (1). 4. The hair dye composition according to claim 1, wherein said compound of formula (1) is present in an amount of 0.01 to 20 wt. % based on the weight of the composition. 5. The hair dye composition according to claim 4, wherein said compound of formula (1) is present in an amount of 0.05 to 10 wt. % based on the weight of the composition. 6. The hair dye composition according to claim 5, wherein said compound of formula (1) is present in an amount of 0.1 to 5 wt. % based on the weight of the composition. 7. The hair dye composition according to claim 3, wherein the total amount of said direct dyes is from 0.05 to 10 wt. %, based on the weight of the composition. 8. The hair dye composition according to claim 7, wherein the total amount of dye is from 0.1 to 5 wt. %, based on the weight of the composition. 9. The hair dye composition according to claim 1, wherein the composition has a pH of 8 to 11. 10. A hair dye composition comprising a two-part aqueous formulation comprising, in a first part, a direct dye compound represented by the following formula (1): wherein, R1,R2,R3and R4each independently represents a C1-6alkyl group which may have a substituent, an alkenyl group which may have a substituent or an aryl group which may have a substituent, or R3and R4,when taken together with the adjacent carbon atom, form a 5- to 12-membered ring, R5represents a hydrogen atom, a C1-6alkyl group which may have a substituent, an alkenyl group which may have a substituent, an aryl group which may have a substituent, or an acyl group, X1and X2each independently represents a hydrogen atom or a halogen atom, Y1and Y2each independently represents a hydrogen atom, a C1-6alkyl group which may have a substituent, an alkenyl group which may have a substituent, a C1-6alkoxy group which may have a substituent or a halogen atom, Z1and Z2each independently represents a hydrogen atom, a C1-6alkyl group which may have a substituent, an alkenyl group which may have a substituent, a C1-6alkoxy group which may have a substituent, a nitro group or a halogen atom, and A-represents an anion; the first part having a pH ranging from 6-11 that is adjusted within said range by an alkali agent; and a second part, comprising an aqueous solution of an oxidizing agent. 11. The hair dye composition according to claim 10, wherein the oxidizing agent is hydrogen peroxide, a persulfate, a perborate, a percarbonate or a bromate. 12. The hair dye composition according to claim 10, wherein the oxidizing agent is present in an amount of 0.5 to 10 wt. % based on the weight of the composition. 13. The hair dye composition according to claim 12, wherein the oxidizing agent is present in an amount of 1 to 8 wt. % based on the weight of the composition. 14. The hair dye composition according to claim 12, wherein the oxidizing agent is combined with a color developer and a coupler in the second part of the composition, each of the developer and the coupler being present in an amount of 0.01 to 20 wt. % based on the weight of the composition. 15. The hair dye composition according to claim 10, wherein each of the color developer and a coupler is present in an amount of 0.5 to 10 wt. % based on the weight of the composition. 16. A hair dye composition, comprising: a three-part aqueous for