Ingres paper is incredibly light-resistant because it is colored in the pulp. All sheets are 65% cotton-laid and chlorine and acid free, with a toothy surface that lends itself well to all dry media techniques. This paper offers superb erasabilty and blendabilty and is an ideal surface for graphite, pen, charcoal and pastels. Paper measures 19.5X25.5, with a 27lb weight.