There are two types of conservation quality mat board--rag cotton and alpha cellulose, and both types meet conservation standards. Alpha cellulose mat board is produced using virgin alpha cellulose purified wood pulp. The virgin alpha cellulose has been chemically treated to eliminate the acids and lignins that can degrade the mat board and the artwork. Available in over 300 colors, this face color on this type of board is created with fade and bleed resistant organic pigments. Research has shown that alpha cellulose boards with MicroChamber technology and zeolite counteract the effects of pollutants over time, including acidic gases such as sulfur dioxide and nitrogen. Bainbridge’s alpha cellulose Artcare mat boards proactively trap and neutralize pollutants and acid by-products that damage artwork. Alpha cellulose mat boards are appropriate for framing valuable art, important or historical documents, and photos or collectibles.