Just a quick note regarding George Bailey's suggestions on using Cortec's VCI products. We have been using them on a variety of architectural and archaeological materials for about four years now and have had excellent success. I strongly recommend that you explore their use. Best, Mike Trinkley Chicora Foundation Inc PO Box 8664 Columbia, SC 29202-8664 803/787-6910 E-mail: [log in to unmask]