Bone char

As animal charcoal, carbo animalis Latin, activated carbon is known that from animal blood ( blood charcoal ) or bones ( bone charcoal ) is made.

For the manufacture of bone char coarsely ground and defatted bones are annealed at 700 ° C under air. The organic substances of the bone are destroyed. This produces ammonia, tar, various gases and bone char.

Use

Bone charcoal is used as other activated carbon. There are both examples of current and historical usage:

For the decolorization of sugar, very large amounts are needed to coal for the filter, for some business coming here animal charcoal used (one of Louis Constant in 1812 patented method). According to self-report any animal charcoal is used in the German sugar producers.

For filtering of aquariums and in the refining of petroleum partly animal charcoal is also used

If a mixture of bone charcoal and sugar ( or syrup ) is heated with concentrated sulfuric acid, the result is bone or bone black ( Cologne Black). For this the black shoe polish, the predecessor of today's shoe cream, canned (hard wax cream ) and colors were made for painting formerly ( until about the beginning of the 20th century).

Medical coal was made ​​of bone charcoal, triggered by figuring out the mineral components with hydrochloric acid mostly. In today's medical charcoal is usually a from plant material such as Wood, produced activated carbon. See also: Charcoal.

The color name ivory black or bone black denotes a black pigment from the original absence of air annealed ivory was recovered.