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Gum prints tend to be multi-layered images sometimes combined with other alternative process printing methods such as cyanotype and platinotype. A heavy weight cotton watercolor or printmaking paper that can withstand repeated and extended soakings is best. Each layer of pigment is individually coated, registered, exposed and washed.
Watercolour paint used in photographic hand-colouring consists of four ingredients: pigments (natural or synthetic), a binder (traditionally arabic gum), additives to improve plasticity (such as glycerine), and a solvent to dilute the paint (i.e. water) that evaporates when the paint dries. The paint is typically applied to prints using a soft ...
Gouache (/ ɡ u ˈ ɑː ʃ, ɡ w ɑː ʃ /; French:), body color, [a] or opaque watercolor is a water-medium paint consisting of natural pigment, water, a binding agent (usually gum arabic or dextrin), [1] and sometimes additional inert material. Gouache is designed to be opaque. Gouache has a long history, having been used for at least twelve ...
The name "gum Arabic" (al-samgh al-'arabi) was used in the Middle East at least as early as the 9th century. Gum arabic first found its way to Europe via Arabic ports, and retained its name of origin. [3] Gum arabic is a complex mixture of glycoproteins and polysaccharides, predominantly polymers of arabinose and galactose.
However, when gum arabic watercolor washes are applied to a highly absorbent surface, such as paper, the effects are long lasting. The wash technique can be achieved by doing the following: With water-based media such as inks, acrylic paints, tempera paints or watercolor paints, a wet brush should be dipped into a pool of very wet and diluted ...
The text mentions a kind of decorative paper called liúshā jiān (流沙箋) meaning 'drifting-sand' or 'flowing-sand notepaper' that was made in what is now the region of Sichuan (Su 4: 7a–8a). This paper was made by dragging a piece of paper through a fermented flour paste mixed with various colors, creating a free and irregular design.
Photographic emulsion is a light-sensitive colloid used in film-based photography. Most commonly, in silver-gelatin photography, it consists of silver halide crystals dispersed in gelatin. The emulsion is usually coated onto a substrate of glass, films (of cellulose nitrate, cellulose acetate or polyester), paper, or fabric.
Acrylic artists' paints may be thinned with water or acrylic medium and used as washes in the manner of watercolor paints, but unlike watercolor the washes are not rehydratable once dry. For this reason, acrylics do not lend themselves to the color lifting techniques of gum arabic-based watercolor paints. Instead, the paint is applied in layers ...
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