Peterboro Conservation is a high end archival matboard that meets or exceeds all tests conducted by the Fine Art Trade Guild, Library of Congress and the International Standard Guide published by FACTS. AN EXCEPTIONAL VALUE...FOR AN EXCEPTIONAL QUALITY PETERBORO DESIGNER SUEDE - A high quality designer suede with a dense luxurious flock mounted on an extra heavy bright white core. • All parts acid free • Easy to cut PETERBORO BLACKCORE - Made with an acid free surface paper, a carbon black pigmented core with a proprietary retention chemistry to minimize rub off and black backing paper to provide a seamless visual appearance. PETERBORO WHITE CORE - All parts of Peterboro White Core Matboards are acid free, buffered to a pH 8.2 +/- 0.5, with a minimum 3% reserve of calcium carbonate, for protection against acidic degeneration. This series is intended for framing posters, unlimited edition prints and general framing where conservation is not a concern.