21. Ground glass surfaces are shown with gray shading.22. The ground glass frameline illumination window of the M3 was replaced with a fresnel-type plastic lens. 23. The serrated portion was coated with a mixture of ground glass , manganese dioxide, and potassium chlorate. 24. Shivs, ground glass in food, long fingernails provided. 25. Once thought by some to be ground glass , these crystals, or tartrates, are harmless and tasteless. 26. Simply adding sand or ground glass to asphalt, for instance, doubles its reflectivity without affecting its strength. 27. But what's a little ground glass in your gullet when the prize is as good as this? 28. The danger from ground glass is mechanical. 29. This leaves empty spaces or " cells " to fill with enamel powders ( ground glass ). 30. "People who live by the crystal ball often end up eating too much ground glass , " he said.
