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Barro negro pottery ("black clay") is a style of pottery from Oaxaca, Mexico, distinguished by its color, sheen and unique designs. Oaxaca is one of few Mexican states which is characterized by the continuance of its ancestral crafts, which are still used in everyday life. [1]
Clay is a type of fine-grained natural soil material containing clay minerals [1] (hydrous aluminium phyllosilicates, e.g. kaolinite, Al 2 Si 2 O 5 4).
The clay moulds are prepared in different shapes and are baked in kiln. Later these clay wares are washed with powdered vegetable matter and are rubbed with mustard oil. They are decorated with floral and geometric patterned grooves using sharp twigs. They are smoke fired with rice husks in enclosed kilns which gives its unique shiny black surface.
Clay earth pigments (naturally formed iron oxides) Raw umber (PBr7): a natural clay pigment consisting of iron oxide, manganese oxide and aluminum oxide: Fe 2 O 3 + MnO 2 + n H 2 O + SiO 2 + Al 2 O 3. When calcined (heated) it is referred to as burnt umber and has more intense colors. Raw sienna (PBr7): a naturally occurring yellow-brown ...
Ceramic colorants are added to a glaze or a clay to create color. Carbonates and oxides of certain metals, characterize most colorants including the commonly used cobalt carbonate, cobalt oxide, chrome oxide, red iron oxide, and copper carbonate. These colorants can create a multitude of colors depending on other materials they interact with ...
Pots are fired on the open ground using wood and manure for fuel. Paints are made with mineral pigments collected locally. The pigments are ground into a powder using a metate grinding stone, then mixed with clay to make a milky fluid paint. [80] Many use traditional colors such as red, white and earth tones, but brighter colors have also been ...
Slip is a liquid clay suspension of mineral pigments applied to the ceramics before firing. Slips are typically red, buff, white, and black; however, Nazca culture ceramic artists in Peru perfected 13 distinct colors of slips. They also used a hand-rotated turntable that allowed all sides of a ceramic piece to be painted with ease.
Ochre (/ ˈ oʊ k ər / OH-kər; from Ancient Greek ὤχρα (ṓkhra), from ὠχρός (ōkhrós) 'pale'), iron ochre, or ocher in American English, is a natural clay earth pigment, a mixture of ferric oxide and varying amounts of clay and sand. [2] It ranges in colour from yellow to deep orange or brown.