koper(II)hydroxide
Bremer green (also: Bremer blue) is the name of a pigment, consisting largely of copper (II) hydroxide, Cu (OH) 2. Confusing is that the names Bremergroen or Bremerblue are also used for synthetic copper carbonate.
The pigment was prepared by reacting copper (II) sulfate (copper nitrile) and sodium hydroxide. Sometimes the whole was made with linseed oil. It has been created occasionally since ancient times. From 1760 industrial production took place, especially in paint mills. Manufacturer Nicolaus Kulenkamp has been producing the pigment in Bremen since 1778, hence the name. The fabric was relatively inexpensive.
Bremer green was used as green-blue wall paint, and, in the form of glue paint, decorative paint, especially at theater decors. In both cases it colored a larger mass of lime and therefore it was also called "lime blue". The tint is fairly saturated. Wooden shipwalls were also painted to counteract growth. In oil paint, the pigment was little used; mixed with linseed oil, a green glacier was formed by saponification within one day. In addition to the toxicity of the fabric, its disadvantage was that the green became blueish over time. Partly for this reason, Bremergroen became untapped and was replaced by the so-called gravel green around 1830. In the beginning of the twentieth century, production ceased. What is now marketed under the name "Bremerblue" consists of a mixture of an organic blue pigment with white. It has in common with the original pigment that it quickly declines.
Bremer green is poorly lit. It can react with sulfur-containing pigments and decontamination under the influence of air pollution. It is glazing. The coloring ability of the fabric is small. It is a cold dish. The Color Index Constitution Number is 77404. It is toxic.
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