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Modacrylic fibers are modified acrylic fibers made from acrylonitriles, but larger amounts of other polymers are added to make the copolymers. The modacrylic fibers are produced by polymerizing the components, dissolving the copolymer in acetone, pumping the solution into the column of warm air (dry-spun), and stretching while hot. [3]
Surface cleaning of parchment is typically completed using white vinyl erasers (solid and grated) and confined to areas where no media is present. Water baths, which sometimes use neutral detergents or alcohol as additives, can be used to clean as well as prepare the parchment for stretching as part of the conservation process. [ 19 ]
Storage of acrylic paintings should be clean and free of dust and heat – below room temperature is best as it will reduce further softening of the top layer of the paint. Exposing acrylic paintings to temperatures ranging near sub zero will cause damaging cracking. Acrylic paint is highly susceptible to mold growth.
Acrylic paint can be cleaned out of a brush with any soap, while oil paint needs a specific type to be sure to get all the oil out of the brushes. Also, it is easier to let a palette with oil paint dry and then scrape the paint off, whereas one can easily clean wet acrylic paint with water. [40]
There are three types of hair: ground hair, guard hair, and whiskers. "Ground hair is used primarily as insulation and is soft, while guard hair is for protection from the elements and tends to be coarse." [3] Both ground hair and guard hair are classified as fur. Because human hair acts as both, it can technically be called "fur".
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Render is applied using a hawk and trowel and pushed on about 12 mm thick to begin. For two coat, some plasterers apply two full depth bands of render (one at the base of the wall and one around chest height) which are screeded plumb and square and allowed to dry while applying the first coat over the remaining exposed wall.
Pyrogallol use, e.g. in hair dye formulations, is declining because of concerns about its toxicity. [10] Its LD 50 (oral, rat) is 300 mg/kg. [3] Pure pyrogallol was found to be extremely genotoxic when inserted into cultured cells, but α amylase proteins protect against its toxicity during everyday exposure. [11] [12]