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Sheets of sandpaper with different grit sizes (40 (coarse), 80, 150, 240, 600 (fine)) Sandpaper, also known as coated abrasive, is a type of material that consists of sheets of paper or cloth with an abrasive substance glued to one face. [1]
Zaffre (also spelt Zaffer), a prescientific, or alchemical substance, is a deep blue pigment obtained by roasting cobalt ore, and is made of either an impure form of cobalt oxide [1] or impure cobalt arsenate. During the Victorian Era, zaffre was used to prepare smalt and to stain glass blue. [2]
This is a list of some physical properties of common glasses. Unless otherwise stated, the technical glass compositions and many experimentally determined properties are taken from one large study. [1]
In borosilicate glasses rich in boron, sulfur imparts a blue color. With calcium it yields a deep yellow color. [4] Manganese can be added in small amounts to remove the green tint given by iron, or in higher concentrations to give glass an amethyst color. Manganese is one of the oldest glass additives, and purple manganese glass was used since ...
In Byzantine art, Jesus and the Virgin Mary usually wore dark blue or purple. Blue was used as a background color representing the sky in the magnificent mosaics which decorated Byzantine churches. [21] In the Islamic world, blue was of secondary importance to green, believed to be the favourite color of the Prophet Mohammed.
To use a colour in a template or table you can use the hex triplet (e.g. #CD7F32 is bronze) or HTML color name (e.g. red).. Editors are encouraged to make use of tools, such as Color Brewer 2 to create Brewer palettes, listed at MOS:COLOR for color scheme selection used in graphical charts, maps, tables, and webpages with accessibility in mind for color-blind and visually impaired users.
The cyanotype was discovered, [2] and named thus, by Sir John Herschel who in 1842 published his investigation of light on iron compounds, [3] expecting that photochemical reactions would reveal, in form visible to the human eye, the infrared extreme of the electromagnetic spectrum detected by his father William Herschel and the ultra-violet or 'actinic' rays that had been discovered in 1801 ...
The French factory Portieux Vallérysthal in 1930 has put opal glass objects on the market in a particular blue-azure color. Some pieces have decorations in pure gold or polychrome enamels and are sometimes equipped with supports or hinges in gilded bronze (sets of plates, cruets, sets of glasses and cups, boxes, lamps, flacons, chandeliers).