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Cadmium paints are made with Cadmium sulphide, cadmium-zinc sulphide, cadmium-seleno sulphide, and there are even "Mercadium" variants that have mercury added for greater heat stability. Lithopone (co-preciated with barium sulphate) varieties also exist.

So, the cadmium content cannot be 100%, since at least one atom of sulphur is bonded to each atom of cadmium.

Plus, there is oil in a tube of paint and various other compounds.

One issue with heavy metal paints is solubility. Insoluble molecules tend to be less dangerous than soluble molecules. Some soluble molecules are much more dangerous than others, too. Dimethyl mercury is a lot more dangerous, for instance, than mercuric sulphide (vermilion).

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Mumyoi Yaki is a traditional craft of Sado Island (佐渡島) in the Nigata prefecture (新潟県). Sado Island used to produce huge quantity of gold. Most Japanese associate Sado Island with its gold mine. The Sado gold mine not only produces gold, but also siliver and the most importantly red clay that contains a very high percentage of natural minerals granule. A long time ago, the red clay collected from the gold mine was used as a medicinal concoction. It was applied to the wound to prevent from bleeding.

In 1819, a man by the name of Ito Kanbei (伊藤甚平) began making Raku Ware (楽焼) using the by-product of the gold mine. In 1857, the pottery in Sado Island was further developed by Ito Tomitaro (伊藤富太郎). At that time, red clay was partially used. It was mixed with other clays in order to get a specific character of Raku Yaki.

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georgia red clay for baseball diamonds / BEAM CLAY / Diamond Pro (also bricks to build mounds)


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Self-healing of Concrete by Bacterial Mineral Precipitation

Repairing cracks in concrete structures is a time consuming, costly but necessary business. TU Delft is researching how the self-healing capacity of concrete structures can be improved by using calcite-precipitating bacteria and what conditions are necessary for these bacteria to thrive.

via ree
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