Acid-free, fine-tooth paper with consistent formation and good erasability mounted on two-ply, 1.2mm white, acid-free, lignin-free, archival conservation board. These boards are smudge-resistant, durable, enduring and ready for framing without mounting. The board is buffered, without optical brighteners, and treated to resist mold. Compliant to ISO9706, the standard for permanent paper. Ideal for detailed drawings and layouts.