What colour are copper sulphate crystals?
Copper(II) chlorate also. It has also been used to colour copper brown. Copper(II) chlorate Copper(II) chlorate is a chemical compound of the transition metal copper and the chlorate anion with basic formula Cu(ClO). Copper chlorate is an oxidiser. It commonly crystallizes with four molecules of water. Copper chlorate can be made by combining a hot one molar solution of copper sulfate, with barium chlorate, which results in the precipitation of barium sulfate. When the solution is filtered, cooled and evaporated under a vacuum blue crystals form. In 1902 A Meusser investigated solubility of copper chlorate. He found that it melted and started
Atramentum oak bark). It is a historically important black dye or pigment fundamentally different from carbon black or black iron oxide pigments. It was also sometimes called "ink stone". It appears greyish-black in water but the colour becomes very deep and lustrous in linseed oil. The iron-based atramentum called "iron gall ink" was in popular use from about the 12th to 19th century. It is currently a subject of conservation effort since many valuable collections are written using it but it causes "ink corrosion". In Jewish tradition, scribes made use of copper sulphate crystals (copper vitriol) in writing holy writ, which