Blackboard

"A blackboard is a reusable writing surface on which text or drawings are made with chalk or other erasable markers. Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone. There are many professional manufacturers who are able to make top quality blackboards most of which can be manufactured in a variety of sizes, styles, and colors. The most common hues are green and black, although shades of brown, blue, and gray are also available. They can be customized during the manufacturing process to include special graphic elements. A music department of a college or university, for example, might request classroom chalkboards with musical staffs imprinted on the surface. A basketball team might use a chalkboard with a court layout to go over game strategies. Such lines are typically painted on the surface, but may also be fused onto the enamel during the manufacturing process. The size of the board may be as large as 120"" x 48"" for classroom use; 42"" x 25"" for basketball court layout; or 72"" x 48"" for stand-alone, moveable boards. "