What is a smooth, or "rounded" aggregate, like sand, but NOT abrasive ? Answered
I made an hourglass as a prop for a local production of "The Wizard of Oz". The "witch" (the actress') still has it at her home. The "glass", which s actually plastic, & made of sections cut from 4 plastic goblets- is becoming less clear because the white sand I used is fogging up the surface with very fine scratches. I'd like to replace this sand (that I got from a craft store, like Joann's) with an aggregate that has smooth round pieces, not rough ones. These wont be so scratchy, and will also be less apt to cram together and clog the narrow passage from the top chamber to the lower one. I googled these words, and got some very technical info about the science of manufacturing concrete and plastic products, but nothing I could use to find or even name what I could buy and use. ALSO, is there a best compound for polishing the inside of the "glass" to restore the original clarity? In other things, I've used brass polish, and even toothpaste!