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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.
Glass containing two or more phases with different refractive indices shows coloring based on the Tyndall effect and explained by the Mie theory, if the dimensions of the phases are similar or larger than the wavelength of visible light. The scattered light is blue and violet as seen in the image, while the transmitted light is yellow and red.
Boeing EC-135C Looking Glass. Looking Glass (or Operation Looking Glass) is the historic code name for an airborne command and control center operated by the United States. In more recent years it has been more officially referred to as the ABNCP (Airborne National Command Post). [1]
Classic old appearance. Midnight Commander is a console application with a text user interface.The main interface consists of two panels which display the file system.File selection is done using arrow keys, the insert key is used to select files and the function keys perform operations such as renaming, editing and copying files.
Borosilicate glass is a type of glass with silica and boron trioxide as the main glass-forming constituents. Borosilicate glasses are known for having very low coefficients of thermal expansion (≈3 × 10 −6 K −1 at 20 °C), making them more resistant to thermal shock than any other common glass.
Cobalt blue is a blue pigment made by sintering cobalt(II) oxide with aluminium(III) oxide (alumina) at 1200 °C. Chemically, cobalt blue pigment is cobalt(II) oxide-aluminium oxide, or cobalt(II) aluminate, CoAl 2 O 4. Cobalt blue is lighter and less intense than the (iron-cyanide based) pigment Prussian blue.
The Tyndall effect in opalescent glass: It appears blue from the side, but orange light shines through. [1] Milk glass contains dispersion particles with a refractive index significantly different from the glass matrix which scatters light by the Tyndall scattering effect. The size, distribution, and density of the particles controls the ...
Depending on the type and color of glass, other additives were used. Lead and tin were added for white opaque glass (latimo). Cobalt was used for blue glass. Copper and iron were used for green and for various shades of green, blue, and yellow. [70] Manganese was used to remove colors. [71]