Create Gritty, absorbent, textured surfaces with the Golden Fine Pumice Gel. They dry hard with a greyish colour from the ground volcanic rock they contain. While generally opaque, these gels contain only clear acrylic gel and ground pumice. Fine Pumice Gel is an excellent ground for charcoal, graphite and pastel, all Pumice Gels have an absorbent quality that works well under or blended with Golden Acrylic colours