... of black papers with their features 1. Wood pulp and environmentally friendly black paper1) neutral PH, environmental protection dye, recycled, no pollution ... , also black color in the middle part.2) the original wood, high stiffness, perfect smoothness and flatness, strong tension.3) ... sides, also black color in the middle part.2) the wood pulp is from American recycled paper, high stiffness, perfect ...