Reference should be made to the articles DYEING, FUCHSINE, SAFRANINE, INDULINES, for more details on this subject.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1" by Various
The Indulines are very useful colouring matters for dyeing navy or dark blues on wool.
"The Dyeing of Woollen Fabrics" by Franklin Beech
Induline belongs to the sober-tinted colours, and produces a shade somewhat resembling indigo.
"Coal" by Raphael Meldola