n (1) The opposite of Acid. Any molecule or ionic substance that can combine with a proton to produce a differnt substance (salts, soaps) (Whitten KW, Davis RE, Davis E, Peck LM, Stanley GG (1994) General chemistry, Brookes/Cole, New York. (2) Reinforcing material (glass fiber, paper, cotton, asbestos, etc) which is impregnated with resin in the forming of laminates and is used as an insulating support for an electrical printed pattern. (3) Metallic salt upon which coloring matter is precipitated to form the insoluble pigments called lakes. (4) A paste or liquid which is to be thinned or tined. (5) In ink manufacture, a dispersion containing usually only one coloring matter, pigment or dye, properly dispersed in a vehicle. This is subsequently used for mixing to produce the desired end product, (Leach RH, Pierce RJ, Hickman EP, Mackenzie MJ, Smith HG, (eds) (1993) Printing ink manual, 5th edn. Blueprint, New York). (6) See Baseboard. (7) See Substrate and Ground.