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Sandpaper is produced in a range of grit sizes and is used to remove material from surfaces, whether to make them smoother (for example, in painting and wood finishing), to remove a layer of material (such as old paint), or sometimes to make the surface rougher (for example, as a preparation for gluing). The grit size of sandpaper is usually ...
The blue hue naturally associates symbolically with sea or sky. [45] As German photographer Thomas Kellner notes of his 1997 Cubist multi-pinhole portraits of porcelain dolls; "I am specially happy with the blue colour in this series as the blue has a different depth in the background than a black print. Blue is still infinite, whereas black ...
Additional ingredients may be added to color the glass. For example, an oxide of cobalt is used to make glass blue. [18] The batch is placed inside a pot or tank that is heated by a furnace. A 2004 description of the Blenko melting process said the batch is heated to about 2600 °F (1427 °C), and cooked for about 24 hours.
Glassine is most commonly used as a base for further silicone coating for the manufacture of release liner.Glassine is also used as an interleaving paper in bookbinding, especially to protect fine illustrations from contact with facing pages; the paper can be manufactured with a neutral pH and can prevent damage from spilling, exposure, or rubbing.
North of the Alps, blue paper was used for drawings from the early 16th century: First by Albrecht Dürer, then demonstrably by Hans Burgkmair and Jörg Breu. [11] In the Netherlands, the material became as a chosen support beginning in the 1630s. [12] The Dutch used logwood, made available by through the West Indies Company, as a
In an unpolluted sky, these spherical particles will primarily be liquid water condensed onto natural atmospheric dust grains. This is known as "wet haze". Therefore, in an unpolluted clear sky, wet haze adds white sunlight to blue Rayleigh-scattered light. More wet haze in the observer's line of sight results in a brighter and paler blue sky ...
It is uncertain when Bristol blue glass was first made but the quality and beauty of the glass swiftly gained popularity, with seventeen glass houses being set up in the city. [3] Lazarus and Isaac Jacobs were the most famous makers of Bristol blue glass in the 1780s. Lazarus Jacobs was a Jewish immigrant to Bristol from Frankfurt am Main, Germany.
Goldstone Goldstone glass under magnification. Goldstone is a type of glittering glass made in a low-oxygen reducing atmosphere.The finished product can take a smooth polish and be carved into beads, figurines, or other artifacts suitable for semiprecious stone, and in fact goldstone is often mistaken for or misrepresented as a natural material.