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wetting back- semi-processed leather is rehydrated. sammying - 45-55%(m/m) water is squeezed out the leather. splitting - the leather is split into one or more horizontal layers. shaving - the leather is thinned using a machine which cuts leather fibres off. neutralisation - the pH of the leather is adjusted to a value between 4.5 and 6.5.
The only type of leather suitable for carving is vegetable tanned, full grain leather. [citation needed] This is because the vegetable tanning process allows the leather to absorb water, which is used to soften the leather before the carving process, and the grain of the leather is necessary to allow the leather to hold the shape after the carving process is complete.
Chrome-tanned leather is tanned using chromium sulfate and other chromium salts. It is also known as "wet blue" for the pale blue color of the undyed leather. The chrome tanning method usually takes approximately one day to complete, making it best suited for large-scale industrial use. This is the most common method in modern use.
Leather painting differs from leather dyeing in that paint remains only on the surface while dyes are absorbed into the leather. Due to this difference, leather painting techniques are generally not used on items that can or must bend nor on items that receive friction, such as belts and wallets because under these conditions, the paint may crack or wear off.
Sheepskin is a natural insulator, and draws perspiration away from the wearer and into the fibers. There, it traps between 30 and 36 percent of its own weight in moisture, and it is for this reason that sheepskin is commonly used to make chamois leather.
The M-1956 intrenching tool carrier [10] was constructed primarily of cotton duck and similar in shape to the earlier M-1943 carrier, reflecting the shape of the blade of the intrenching tool and incorporating an opening at the bottom for the handle of the tool. Leather reinforcement protected the duck from the edges of the tool blade.