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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 ...
Watercolor paint consists of four principal ingredients: [61] a pigment; gum arabic [62] [63] as a binder to hold the pigment in suspension; additives like glycerin, ox gall, [64] honey, and preservatives to alter the viscosity, hiding, durability or color of the pigment and vehicle mixture; and, evaporating water, as a solvent used to thin or ...
Gum arabic is used as a binder for watercolor painting because it dissolves easily in water. Pigment of any color is suspended within the acacia gum in varying amounts, resulting in watercolor paint. Water acts as a vehicle or a diluent to thin the watercolor paint and helps to transfer the paint to a surface such as paper .
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 ...
However, the word emulsion is customarily used in a photographic context. Gelatin or gum arabic layers sensitized with dichromate used in the dichromated colloid processes carbon and gum bichromate are sometimes called emulsions. Some processes do not have emulsions, such as platinum, cyanotype, salted paper, or kallitype.
Watercolor is a technique made with transparent pigments diluted in water, with binders such as gum arabic or honey, using the white of the paper itself. Known since ancient Egypt, it has been a technique used throughout the ages, although with more intensity during the 18th and 19th centuries. [41]