Armstrong; Wynne Chem. News J. Ind. Sci., 1890 , vol. 61, p. 165,93 Full Text Show Details Dahl and Co. Patent: DE41957 ; Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 1, p. 407 Full Text Show Details Armstrong; Wynne Chem. News J. Ind. Sci., 1890 , vol. 62, p. 163