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Arsenic, in the form of white arsenic trioxide As 2 O 3, was a highly favored poison, being odourless, easily incorporated into food and drink, and before the advent of the Marsh test, untraceable in the body. In France, it came to be known as poudre de succession ("inheritance powder").
Anthrax hoaxes were sporadically reported in the 1990s, [3] including a petri dish in an envelope labeled "anthrachs"[sic] sent to B'nai B'rith in Washington in 1997 that contained harmless Bacillus cereus, [4] [5] [6] but a spate of anthrax threats followed the 1998 arrest of Larry Wayne Harris, a microbiologist and white supremacist.
The fingerprint powder must be a suitable colour for the surface in question by providing contrast. [3] [6] [8] The details of fingerprints deposited on light surfaces are best visualized by applying dark or black coloured powders. [3] [6] [8] Conversely, white or grey powders are recommended for enhancing fingerprints found on dark surfaces ...
The white compound is enzymatically reduced to red TPF (1,3,5-triphenylformazan) in living tissues due to the activity of various dehydrogenases (enzymes important in oxidation of organic compounds and thus cellular metabolism), while it remains as white TTC in areas of necrosis since these enzymes have been either denatured or degraded.
Cocaine can be in the form of fine white powder and has a bitter taste. Crack cocaine is a smokeable form of cocaine made into small "rocks" by processing cocaine with sodium bicarbonate (baking soda) and water. [12] [48] Crack cocaine is referred to as "crack" because of the crackling sounds it makes when heated. [12]
Diatomite rock sample from Sisquoc Formation Scanning electron micrograph of diatomaceous earth. Diatomaceous earth (/ ˌ d aɪ. ə t ə ˈ m eɪ ʃ ə s / DY-ə-tə-MAY-shəs), also known as diatomite (/ d aɪ ˈ æ t ə m aɪ t / dy-AT-ə-myte), celite, or kieselguhr, is a naturally occurring, soft, siliceous sedimentary rock that can be crumbled into a fine white to off-white powder.
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Streak plates with pyrite (left) and rhodochrosite (right). The streak of a mineral is the color of the powder produced when it is dragged across an unweathered surface. Unlike the apparent color of a mineral, which for most minerals can vary considerably, the trail of finely ground powder generally has a more consistent characteristic color, and is thus an important diagnostic tool in mineral ...