Discover the fascinating process of growing vibrant crystals from potassium ferricyanide, copper sulfate, and potassium alum with this in-depth crystal experiment. Watch as we prepare saturated ...

WITH regard to the above crystals, described by Prof. Stokes in NATURE (April 16, p. 565), I should like to suggest, with some diffidence, that the colours may be due, not to a continuous hemitropic ...