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Friction, as from holster wear, quickly removes cold bluing, and also removes hot bluing, rust, or fume bluing over long periods of use. It is usually inadvisable to use cold bluing as a touch-up where friction is present. If cold bluing is the only practical option, the area should be kept oiled to extend the life of the coating as much as ...
Engineer's blue is prepared by mixing Prussian blue with a non-drying oily material (for example, grease).The coloured oil is rubbed onto a reference surface, and the workpiece is then rubbed against the coloured reference; the transfer (by contact) of the pigment indicates the position of high spots on the workpiece or conversely highlight low points. [1]
Neither of these are bluing (even a blue oil finish). Bluing is a chemical change to the surface, brought about by supplying more than just oxygen. Andy Dingley 20:13, 5 May 2011 (UTC) Browning (steel) redirects here, by the way. Huw Powell 03:24, 1 August 2012 (UTC)
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These tanks contain, in order, alkaline detergent, water, sodium hydroxide at 140.5 °C (284.9 °F) (the blackening compound), and finally the sealant, which is usually oil. The NaOH (caustic soda) and elevated temperature cause Fe 3 O 4 (black oxide) to form on the surface of the metal instead of Fe 2 O 3 (red oxide; rust). While it is ...
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Manufacturers of baby powder and cosmetic products made with talc will have to test them for asbestos under a proposal announced by the U.S. Food and Drug Administration.