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This basification process fixes the tanning material to the leather, and the more tanning material fixed, the higher the hydrothermal stability and increased shrinkage temperature resistance of the leather. The pH of the leather when chrome tanned would typically finish somewhere between 3.8 and 4.2. [6]
Tanned leather. Tanning, or hide tanning, is the process of treating skins and hides of animals to produce leather. A tannery is the place where the skins are processed. Historically, vegetable based tanning used tannin, an acidic chemical compound derived from the bark of certain trees, in the production of leather. An alternative method ...
The leather manufacturing process is divided into three fundamental subprocesses: preparatory stages, tanning, and crusting. A further subprocess, finishing, can be added into the leather process sequence, but not all leathers receive finishing. The preparatory stages are when the hide is prepared for tanning.
Heat generated by friction during the glazing process can darken and harden the aniline finish of the leather, and can raise oils in the leather to the surface. Because no pigment is used, the porous structure of the leather remains visible, providing a depth to its appearance. The operator of the glazing jack can control the surface finish by ...
In modern leather preservation, the original surface coating may be stripped completely off to provide a uniform replacement finish. This method is not advised for historical pieces, but is appropriate for reproductions and modern leather works, as they may prolong the life of the material without compromising the historical value or integrity.
Ostrich leather is the result of tanning skins taken from African ostriches farmed for their feathers, skin and meat. The leather is distinctive for its pattern of vacant quill follicles , forming bumps ranged across a smooth field in varying densities.
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Early 20th century currier's knife manufactured by Nicolai Clasen, Hamburg, Germany. A currier is a specialist in the leather-processing trade.After the tanning process, the currier [1] applies techniques of dressing, finishing and colouring to a tanned hide to make it strong, flexible and waterproof. [2]
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