Crescent - Ragmat Antiquarian - 32x40 - Light Umbria - Crescent Antiquarian RagMat Boards have a natural cream 100% cotton core & backing paper. Cotton is naturally acid-free and lignin-free. Antiquarian features subtle surface paper and a natural cream core that coordinate with the period colors of antique art while providing high quality conservation protection. Recommended for fine art prints, limited edition prints, valuable documents, photographs and heirloom needle art. Cotton RagMat is the only matboard guaranteed safe next to any artwork. It is the natural choice when the highest levels of protection are required.