The coal tar colours of Farbwerke vorm. Meister, Lucius & Brüning, Hoechst on Main, Germany, and their application in wool dyeing (1910)
Farbwerke vorm. Meister Lucius & Brüning · New York, H. A. Metz · leaf 183
it is advisable to start the dyebath cold, until the colour is sufficiently taken up by the felt.Very thick and closely milled felts, which have to be well dyed through, cannot be dyed with
Dyes and dyeing
Internet Archive · Clark Art Institute Library · Public Domain Mark 1.0. Free to use for anything.