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Litmus is a water-soluble mixture of different dyes extracted from lichens. It is often absorbed onto filter paper to produce one of the oldest forms of pH indicator, used to test materials for acidity. In an acidic medium, blue litmus paper turns red, while in a basic or alkaline medium, red litmus paper turns blue. In short, it is a dye and ...
Cutting Board made of Birdseye Maple. Bird's eye is a type of figure that occurs within several kinds of wood, most notably hard maple. It has a distinctive pattern that resembles tiny, swirling eyes disrupting the smooth lines of grain. It is somewhat reminiscent of a burl, but it is quite different: the small knots that make the burl are missing.
Excelsior, or wood wool. Wood wool, known primarily as excelsior in North America, is a product made of wood slivers cut from logs. It is mainly used in packaging, for cooling pads in home evaporative cooling systems known as swamp coolers, for erosion control mats, and as a raw material for the production of other products such as bonded wood wool boards.
Burl wood is very hard to work with hand tools or on a lathe, because its grain is twisted and interlocked, causing it to chip and shatter unpredictably. This "wild grain" makes burl wood extremely dense and resistant to splitting, which made it valued for bowls, mallets, mauls and "beetles" or "beadles" for hammering chisels and driving wooden ...
Wood science [1] is the scientific field which predominantly studies and investigates elements associated with the formation, the physical and chemical composition, ...
Ammonia fuming is a wood finishing process that darkens wood and brings out the grain pattern. It consists of exposing the wood to fumes from a strong aqueous solution of ammonium hydroxide which reacts with the tannins in the wood. The process works best on white oak because of the high tannin content of this wood.
Chromosomes of Allium ascalonicum stained with orcein. The chemical components of orcein were elucidated only in the 1950s by Hans Musso. [6] The structures are shown below. A paper originally published in 1961, embodying most of Musso's work on components of orcein and litmus, was translated into English and published in 2003 [7] in a special issue of the journal Biotechnic & Histochemistry ...
A silver porringer created by John Coney, c. 1710, Birmingham Museum of Art. A porringer is a shallow bowl, between 4 and 6 inches (100–150 mm) in diameter, and 1 + 1 ⁄ 2 to 3 inches (38–76 mm) deep; the form originated in the medieval period in Europe and was made in wood, ceramic, pewter, cast iron and silver.