Saffranine is detected by the action of hydrochloric acid, which turns it to a beautiful blue; the red color is restored by washing in water.
"Scientific American Supplement, No. 363, December 16, 1882" by Various
Saffranine Prima, 1 lb.
"The Dyeing of Woollen Fabrics" by Franklin Beech
Absorption of colouring } Saffranine 0.7 0.0 matters at 100 deg.
"Researches on Cellulose" by C. F. Cross