Hydroxypropyl cellulose (HPC) as a cholesteric liquid crystal was coloured with purple ink from Dolabella auricularia as a sea hare. Optical texture of the liquid crystal mixture was confirmed with a polarising optical microscope.
International Letters of Natural Sciences (Volume 50)
Y. Kudo and H. Goto, "Applications of Natural Purple from Dolabella auricularia: Colouration of Cholesteric Liquid Crystals", International Letters of Natural Sciences, Vol. 50, pp. 1-6, 2016