Bristol board is a type of heavy, high quality paper which was originally produced in Bristol, England, in the early 1800s for the purpose of painting, illustrating, and drawing. It continues to be used for all of these purposes, along with the production of post cards, wedding invitations, technical drawings, illustrations, and a wide variety of works of art. Many art supply stores carry Bristol board and can order specialty products by request, and it is also possible to order numerous types online.
Manufacturers of Bristol board usually state the heaviness of the paper in terms of "plies," referring to how many layers of paper have been sandwiched together to make the Bristol board. Three-ply Bristol board, for example, is heavier than two-ply. The thickness of the plies can vary, however, which means that the number of plies isn't the ultimate measure of how heavy and thick the paper will be.

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