. "Particularly valuable deystuifs are obtained from those Where D represents a sulphonated phenyl or naphthyl radicals; the phenyl radical may be further substituted for example, by halogen atoms such as chlorine, alkyl radicals such as methyl, acylamino groups such as acetylamino and alkoxy radicals such as methoxy. (ii) 1:1 metal complex, especially copper complex, derivatives of monoazo compounds" . . . .