Blackboard

A blackboard (also known as a chalkboard) is a reusable writing surface on which text or drawings are made with sticks of calcium sulfate or calcium carbonate, known, when used for this purpose, as chalk. Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone. Modern versions are often green because the colour is considered easier on the eyes.

Design

A blackboard can simply be a piece of board painted with matte dark paint (usually black or dark green). Black plastic sign material, using the trade name sintra is also used to create custom chalkboard art. Examples can be seen at Chalk It Up Signs. A more modern variation consists of a coiled sheet of plastic drawn across two parallel rollers, which can be scrolled to create additional writing space while saving what has been written. The highest grade blackboards are made of a rougher version porcelain enamelled steel (black, green, blue or sometimes other colours). Porcelain is very hard wearing and blackboards made of porcelain usually last 10–20 years in intensive use.

Chalkboard (disambiguation)

Chalkboard is another term for a blackboard, a board to write on with chalk.

Chalkboard may also refer to:

See also

Chalkboard (typeface)

Chalkboard is a font released by Apple in 2003. It was released as part of Mac OS X v10.3 and the 10.2.8 update. It is regularly compared to Microsoft's Comic Sans font, which has shipped with Mac OS since Mac OS 8.6 in 1999, although it is not a perfect substitute font since the two are not metrically compatible. Although it is similar to the font Comic Sans, it is much less known and also less criticized.

References

See also