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