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High Humidity reduces mechanical damage such as brittle paint but raises the risks of biological organisms, e.g. white efflorescence and green-to-black stains on a panel painting. [12] High Humidity also raises the risks of curving or warping of the wood over time, forcing the paint to flake off.
Japan black (also called black japan and bicycle paint [1]) is a lacquer or varnish suitable for many substrates but known especially for its use on iron and steel. It can also be called japan lacquer and Brunswick black. Its name comes from the association between the finish and Japanese products in the West. [2]
Japanning is most often a heavy black lacquer, almost like enamel paint. Black is common, and japanning is often synonymous with black japanning. The European technique uses varnishes that have a resin base, similar to shellac, applied in heat-dried layers which are then polished, to give a smooth glossy finish. It can also come in reds, greens ...
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Example of an oak panel in its original state, the back of a Jan Davidsz. de Heem still life. Cradling is a process used in the restoration and preservation of paintings on wooden panel . It consists in mounting a grid of wooden slats to the back of a painting to create a reinforcement and preserve the flat paint surface.
During firing of the enamel at between 760 and 895 °C (1,400 and 1,643 °F), iron oxide scale first forms on the steel. The molten enamel dissolves the iron oxide and precipitates cobalt and nickel. The iron acts as the anode in an electrogalvanic reaction in which the iron is again oxidised, dissolved by the glass, and oxidised again with the ...