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such as tripoli are highly toxic if inhaled in powder form. 6. Vibration from pneumatic equipment can cause Raynaud’s phenomenon, (“white fingers” or “dead fingers”) a circulation disease. The hazard is greater with exposure to cold, (e.g. the air blast from pneumatic tools). This temporary condition can spread to the whole hand and cause permanent damage. Stones can be finished by grinding, sanding, and polishing, by either hand or with machines. Polishing can use a variety of materials, depending on the hardness of the stone being polished. Polishing materials include carborundum , corundum , diamond dust, pumice, putty powder , rouge , tripoli , and cerium oxide. 5. Fixing baths contain large concentrations of silver thiocyanate, well above the 5 ppm of silver ion allowed by the U.S. Clean Water Act. Collect fixers and either pour into the silver recovery unit or dispose as hazardous waste. 4. Wear gloves, goggles and protective apron when mixing and handling color processing chemicals. When diluting solutions containing concentrated acids, always add the acid to the water. An eyewash should be available. Many of the chemicals used in other steps of color processing are essentially the same as those used for black and white processing. Examples include

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