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Jack-on-jack - Layout pattern in which courses of tiles align vertically.

Japan colors - Concentrated oil-based colorants that are used for tinting alkyd paints and solvent-soluble glazes. Japan colors have an intense, flat color and will dry quickly.

Jasper - An opaque form of quartz that is usually yellow, brown, red or green.

Joint - The space between the adjacent surfaces of two components joined and held together by nails, glue, cement, mortar or other means.

Joint compound - A plaster-like substance used to fill seams and irregularities in drywalling, either the vinyl-based drying type, which hardens as the water medium dries, or setting type, which hardens by a chemical reaction that is catalyzed by water.

Joint filler - Sealant inserted between abutting ends of wallboard.

Joint tape - Paper or synthetic mesh tape about 3-inches wide that is used to bridge the seams between drywall panels.

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