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Niter and colour case. In the nitre bluing process, polished and cleaned steel parts are immersed in a bath of molten salts—typically potassium nitrate and sodium nitrate (sometimes with 9.4 grams (0.33 oz) of manganese dioxide per pound of total nitrate). The mixture is heated to 310 to 321 °C (590 to 610 °F) and the parts are suspended in ...
Bluing (steel) is a passivation process in which steel is partially protected against rust Bluing may also refer to: Bluing (fabric), a blue dye used to improve the appearance of fabrics; Bluing (hair), a blue dye used to improve the appearance of hair "bluing" of machine parts to check for tolerances, see engineer's blue
Niter or nitre [5] is the mineral form of potassium nitrate, KNO 3.It is a soft, white, highly soluble mineral found primarily in arid climates or cave deposits. Historically, the term niter was not well differentiated from natron, both of which have been very vaguely defined but generally refer to compounds of sodium or potassium joined with carbonate or nitrate ions.
The process of heating steel after it has been hardened, known as tempering, can impart colors to steel ranging from pale yellow "straw" to very light blue. When done for decorative purposes it can be referred to as "Fire bluing", see the article on tempering for pics and more.
One process for X-ray fluorescence assay involves melting the material in a furnace and stirring to make a homogeneous mix. Following this, a sample is taken from the centre of the molten sample. Samples are typically taken using a vacuum pin tube. [4] The sample is then tested by X-ray fluorescence spectroscopy. Metallurgical assay is ...
One of the best post-Christmas sales we look forward to every year is Nordstrom's Half-Yearly Sale, which typically kicks off the day after Christmas and lasts for a couple of weeks.Ring in the ...
racy our young patriots expect to inherit—is in the process of being altered forever. History has a great deal to teach us about what is happening right now—what has happened since 2001 and what could well unfold after the 2008 election.But fewer and fewer of us have read much about the history of the mid-twentieth century—or
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]