The present invention discloses a yellow dye compound having a structure of the following formula (I): ##STR00001## wherein M is H, Li, NH.sub.4 or Na. The dye compound of the present invention is particularly applied to yellow dye compound for paper-printing ink jet ink and can be made into yellow ink jet ink with greenish yellow, wide color gamut, and excellent solubility.

 
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> Photochemical transformation of metallic and non-metallic ions in an aqueous environment

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