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During clinical trial s oJ the value of 4A' diaminodiphenyl s ulphon e ll1 the treatment of leprosy (r.10Iesworth and Narayanaswami (I)), a considerable number of estimations have been made to determine blood sulphone levels. The method, which has been used, depends on the development of a purplish red col ou r by coupling the diazotised s u l p hone with N (I-Naphthyl )-ethylene diamine and has proved satisfa ctory for l::!ood . At th e same time, it was considered to be desirable to esti m adoi:10.5935/0305-7518.19500002 fatcat:a7luoucijraqdgv67oohjyiuoq