NPT StoneScapes® Touch of Glass BLACK TOUCH OF GLASS 1/2 Black Pebble Pool Finish .5 Parent Kit. StoneScapes Touch of Glass Aqua Cool creates light blue water color and is comprised of modified white Portland cement and features natural white quartz pebble aggregates and Cobalt Blue colored quartz highlights with subtle Cobalt Blue glass bead accents. The glass bead accents enhance the water color by adding additional pops of color and contrast that only colored glass bead can do. The beauty of this finish comes from the shade and color variations inherent in natural materials. Some naturally occurring seashell can be seen in this pebble mix which comes from the beaches of Baja California.