Winsor & Newton-Artist Vine Charcoal Sticks. These charcoal sticks are of the highest quality and specially prepared. The wood is correctly baked to produce an even line of consistent intensity. Vine charcoal produces a rich dark gray line. This package contains twelve sticks of vine charcoal. Available in extra-soft, soft, medium, and hard (each sold separately). Conforms to ASTM D4236. Imported.