Horsehair is the long, coarse hair growing on the manes and tails of horses. It is used for various purposes, including upholstery, brushes, the bows of musical instruments, a hard-wearing fabric called haircloth, and for horsehair plaster, a wallcovering material formerly used in the construction industry and now found only in older buildings.
Horsehair can be very stiff or very fine and flexible; mane hair is generally softer and shorter than tail hair. The texture of horsehair can be influenced by the breed and management of the horse, including natural conditions such as diet or climate. Processing may also affect quality and feel.
Horsehair fabrics are woven with wefts of tail hair from live horses and cotton or silk warps. Horsehair fabrics are sought for their lustre, durability and care properties and mainly used for upholstery and interiors.
Horsehair is used for the crafts of horsehair hitching, horsehair braiding, pottery, and in making jewelry items such as bracelets, necklaces, earrings and barrettes. It is used to make some wall and fine arts paintbrushes. Painting is one of the areas where horsehair is still widely used today. The horsehair is processed, cut to size and fitted to paint brushes that are used for anything from painting walls to painting pictures to be hung in galleries. Horsehair is desirable for paint brushes because of its smooth lay and ability to hold a large amount of paint acting as a reservoir and allowing the painter to stop less frequently.
Most horsehair comes from slaughtered horses. Hair for bows comes from tails of horses in cold climates, and is sorted by size. It comes primarily from stallions and costs $150–$400 per pound because of the sorting needed to extract long hairs. Mongolia produces 900 tons of horsehair per year.
There has been some speculation as to the first use of horsehair. Many sources indicate the Spaniards in the 8th century were the first to use horsehair as a textile. However, the first documented use was from the 9th century in Switzerland where the Swiss used it for the plans of St. Gall Abbey. The plans, a blueprint for a monastic compound in medieval times, are a national preserved treasure to the Swiss that were said to have been woven with horsehair.
It was commonly used in the 19th century as upholstery stuffing (such as for fabric sofas) and as covering fabric for furniture. It was almost always the fiber used to make shaving brushes. It was also common in hats and women's undergarments. It was used in the hair to create the "Gibson Girl" look, and in the 18th century it was used in wigs. Until the 20th century, it was commonly used to make fine arts paintbrushes, along with sable, fox, wolf, goat, and lamb hair. Calligraphy brushes are made from rabbit, fox, or horse hair, among others. For thousands of years, fishing lines were made of plaited horsehair.
In modern times, mane and tail horsehair samples with root tissue attached are commonly used for DNA analysis of equine specimens. Private genetic testing companies regularly use the DNA extracted from the root follicle of horsehair for relationship testing, genetic disease assays and determining coat color genetics.
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