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Mahogany is a reddish-brown color. It is approximately the color of the wood mahogany. However, the wood itself, like most woods, is not uniformly the same color and is not recognized as a color by most. The first recorded use of mahogany as a color name in English was in 1737. [2]
Wood ash is around 1% the mass of the original wood, though some kinds of straw leave ash at a much higher percentage of the original weight. [9] Usually a large quantity of wood or straw is necessary to produce the ash. The ash is then put through a sieve to eliminate the excess clumps from the ash. At this point, artists can process the ash ...
The burning of wood results in about 6–10% ashes on average. [2] The residue ash of 0.43 and 1.82 percent of the original mass of burned wood (assuming dry basis, meaning that H 2 O is driven off) is produced for certain woods if it is pyrolized until all volatiles disappear and it is burned at 350 °C (662 °F) for 8 hours.
Growth rings aren't always well-defined, and the wood can be rather plain-looking; though certain figure is occasionally present, such as curly or mottled grain. The sapwood and the heartwood are not usually distinguishable. The heartwood is a light yellowish-brown, sometimes with a pinkish hue. Color tends to darken with age.
Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption. Following ejection and deposition, the ash is lithified into a solid rock. [1] [2] Rock that contains greater than 75% ash is considered tuff, while rock containing 25% to 75% ash is described as tuffaceous (for example, tuffaceous sandstone). [3]
European ash in flower Narrow-leafed ash (Fraxinus angustifolia) shoot with leaves. Fraxinus (/ ˈ f r æ k s ɪ n ə s /), commonly called ash, is a genus of plants in the olive and lilac family, Oleaceae, [4] and comprises 45–65 species of usually medium-to-large trees, most of which are deciduous trees, although some subtropical species are evergreen trees.
Fraxinus americana, the white ash or American ash, is a fast-growing species of ash tree native to eastern and central North America. White ash trees are threatened by the invasive emerald ash borer .
Photomicrograph made with a scanning electron microscope and back-scatter detector: cross section of fly ash particles. Fly ash, flue ash, coal ash, or pulverised fuel ash (in the UK)—plurale tantum: coal combustion residuals (CCRs)—is a coal combustion product that is composed of the particulates that are driven out of coal-fired boilers together with the flue gases.