(Rosaniline sulphite does not combine directly with aldehydes. When a sulfurous solution of rosaniline hydrate or rosaniline acetate is shaken with any aldehyde, then the yellow solution immediately becomes a red color that little by little transforms into a fine violet, [which is] more or less intense according to the aldehyde [that's] used.) See also: Schiff, Hugo (1867) "Dérivés de la rosaniline" (Derivatives of rosanaline [i.e., fuchsine]), Comptes rendus, 64 : 182–184. [in French] From p.