UART Premium Sanded Pastel Paper is pH neutral and acid free. It accepts underpainting using a wide variety of media such as watercolour, oil or acrylic paints. After the underpainting process, the tooth still holds many layers of pastel, charcoal or pencil and the grain will remain affixed to the paper. With different grades in a variety of formats, UART meets the needs of the most demanding artists. An innovative fine-arts paper that stands out. Technical specifications: pH neutral, acid free, accepts all wet media, no fixatives required, consistent and reliable sanded surface, archival quality