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The bleaches used to remove unwanted fungal stains from wood include two-part peroxide bleach and solutions of sodium hypochlorite. [27] The former is particularly effective at removing the natural colour of wood before it is recoloured with pigmented stains or dyes. [27] Oxalic acid is particularly effective at removing iron stains from wood. [27]
Topical sealers can provide visual enhancement as well as topical protection from stains and chemicals. They require a dry, clean surface during application to gain adhesion. Topical sealers may alter the coefficient of friction which can make substrates slick when wet – a condition that can be remedied by adding anti-skid materials.
In 1875, Sherwin-Williams started selling ready-mixed paint. [4] Previously, consumers bought paint ingredients that they themselves would mix together. [4] In the 1940s, Sherwin-Williams introduced Kem-Tone, a water-based fast-drying interior paint. [4] In 1996, the American Chemical Society named the product a National Historic Chemical Landmark.
Stone sealing is the application of a surface treatment to products constructed of natural stone to retard staining and corrosion. [1] All bulk natural stone is riddled with interconnected capillary channels that permit penetration by liquids and gases.
Elsewhere, lumber usually refers to felled trees, and the word for sawn planks ready for use is timber. [46] In Medieval Europe oak was the wood of choice for all wood construction, including beams, walls, doors, and floors. Today a wider variety of woods is used: solid wood doors are often made from poplar, small-knotted pine, and Douglas fir.
Imagine a cap with 20% vol and floor with 30% vol. Long cap, short floor gives a swap with no vol. Now, interchange the vols. Cap price goes up, floor price goes down. But the net price of the swap is unchanged. So, if a cap has x vol, floor is forced to have x vol else you have arbitrage.
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