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The terms "water glass" and "soluble glass" were used by Leopold Wolff in 1846, [9] by Émile Kopp in 1857, [10] and by Hermann Krätzer in 1887. [11] In 1892, Rudolf Von Wagner distinguished soda, potash, double (soda and potash), and fixing (i.e., stabilizing) as types of water glass. The fixing type was "a mixture of silica well saturated ...
When water is in small quantities (e.g. in a glass) it appears colorless to the human eye. The color of water varies with the ambient conditions in which that water is present. While relatively small quantities of water appear to be colorless , pure water has a slight blue color that becomes deeper as the thickness of the observed sample increases.
Cobalt glass for decoration. Cobalt glass—known as "smalt" when ground as a pigment—is a deep blue coloured glass prepared by including a cobalt compound, typically cobalt oxide or cobalt carbonate, in a glass melt. Cobalt is a very intense colouring agent and very little is required to show a noticeable amount of colour.
Details of the process and the composition of the glass vary and so do the results, because it is not a simple matter to obtain or produce properly controlled specimens. [5] Small concentrations of cobalt (0.025 to 0.1%) yield blue glass. The best results are achieved when using glass containing potash. Very small amounts can be used for ...
A lump of glass was found at Eridu in Iraq that can be dated to the twenty-first century BC or even earlier; it was produced during the Akkadian Empire or the early Ur III period. [4] The glass is of blue colour, which was achieved with cobalt; such glass is generally known as Egyptian blue. Thus, such technique was attested in Eridu long ...
Both experts agree it’s best to store water in glass bottles with closed caps. Riese is a strong believer in glass bottles, “as glass does not give anything to water or of water, so it’s the ...
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