Whiteboard
Whiteboards became commercially available in the early 1960s, but did not become widely used until 30 years later. Early whiteboards needed to be wiped with a damp cloth and markers had a tendency to leave marks behind, even after erasing the board. Dry-erase markers for whiteboards were invented in 1975.
Bristol board
Bristol board (also referred to as Bristol paper or Super white paper) is an uncoated, machine-finished paperboard. It is named after the city of Bristol in the southwest of England as that is where it was first produced. Common sizes include and its bulk thickness is or higher and A4, A3, A2 and A1. Bristol board may be rated by the number of plies it contains or, in Europe, by its grammage of 220 to 250 g/m. It is normally white, but is also made in different colours.