Crescent - 215.6 Illustration Board - Hot Press - 20x30 - Crescent Hot Press Illustration Boards have a very smooth surface. Crescent Illustration Board is great for use with ink, and is a common graphic design surface. Illustration Board is also widely used for mounting. Crescent 215 Illustration Board is a medium weight, professional grade board with a bright white surface for greater contrast with inks and more transparent acrylic washes. Each board is 18-Ply and 1.5 mm thick.