The article by Chikramane et al. ‘Extreme Homeopathic Dilutions Retain Starting Materials: A Nanoparticulate Perspective’, in Homeopathy 99 (2010), pp. 231–242 reports the fascinating observation that high potency homeopathic remedies made from specific metals, prepared at two different commercial plants in India, contain measurable amounts of the starting material, even at 200c