CHANGE of NATURAL DECORATIVE PROPERTIES of WOOD. Methods of superficial and deep dyeing

Practice develops methods superficial (on depth from 0,2 to 0,5 mm) and deep dyeing (through or on depth more than 0,5 mm). Dyeing is made water or spirit by solutions (from 0,5 to 5%-s' concentration) various organic dyes (water-soluble smesevymi aniline dyes acid, direct, the basic and other groups). Protravnoe colouring is based on chemical interaction of alkalis or salts of metals (hromovokislogo or dvuhromovokislogo kalija, chloric or sernokislogo gland, chloric or sernokisloj copper, etc.) With the tannins containing in wood. As a result on a surface the organic salts of metals changing colour of wood are formed. At institute of chemistry of wood of Academy of sciences of Latvia the way of improvement of decorative properties of an interline interval of wood of a birch, a grey and black alder, a larch, an oak and an ash-tree by chemical processing of an interline interval by gaseous ammonia is developed. Chemical processing allows to receive in regular intervals painted surface simulating the general colour tone of wood of a nut.

, compoundings of solutions, and modes of dyeing numerous kinds of dyes Are developed for reproduction of the general colour tone of simulated breed of wood.

Considerable interest represents superficial bleaching of some tree species (a birch, a maple, an ash-tree, etc.) for the purpose of change of their decorative properties and removal of non-uniform natural colouring. Bleaching make solutions chloric to exhaust, peroxides of hydrogen or shchavelevoj acids, processing them a wood blanket.