(1) Funerary uses of vermillion, a form of mercuric sulfide, were common in China before they spread to western Japan.(2) But samples seized by police contained only mercury oxide, mercuric iodide, or mercury mixed with red dye-hardly materials of interest to weapons-makers.(3) The first eyeshadows used lead and antimony sulfide, and lips were reddened with mercuric sulfide, both highly toxic substances.(4) Zalups et al. have suggested that urinary mercury excretion is related positively to the degree of cellular damage during acute mercuric chloride-induced renal damage.(5) Transgenic yellow poplar plants overexpressing the bacterial gene encoding mercuric reductase were developed for the phytoremediation of mercury pollution.(6) The term ‘mad as a hatter’ comes from the use of mercuric nitrate which was used in the felting process of making hats.(7) The zinc salt components mimic mercuric chlorides but without toxicity and are used in other modern fixatives to replace B5-type fixation.(8) The others were chlorocresol, cresol, parabens, phenol, phenylethanol, phenyl mercuric salts and thimerosal;(9) The authors also thank their colleague for sending them the coordinates of mercuric ion reductase.(10) Synthetic steroids, phenylbutazone, lead or mercuric sulphide can be added.(11) For example, toxic materials such as lead, sulfuric acid, and mercuric sulfide were used.(12) Then a French pharmacist named Pierre Bayen pointed out to Lavoisier that calx of mercury, which we would now call mercuric oxide, can be converted to mercury simply by heating, without the need for phlogiston-rich charcoal.(13) Cinnabar is heated in air until the mercuric sulfide of which it is made breaks down to yield pure mercury metal: HgS - heat Hg + S.(14) Vermilion paint, made from mercuric sulphide, was then splashed onto the image's wrists, feet and body to represent blood.(15) However, in the intestine, small amounts are converted to the more soluble mercuric salts, which are absorbed, expressing its characteristic toxic effects.(16) This would be analogous to other flavoproteins such as mercuric ion reductase, lipoamide dehydrogenase, and thioredoxin reductase.