Pickling pastes

A stainless steel surface should never be abraded with a wheel or brnsh that has been nsed on a carbon or low-aUoy steel wire brushes with bristles that are not made of a stainless steel of similar composition should also be avoided. Conversely, attempting to repair a heat-tinted region with only a pickling paste or acid solution may stain or even corrode the base metal if the solntion is overly aggressive or is allowed to eontact the surface for an extended time. 

Chem. Descrip. Polyacrylamide aq. sol n. dispersed in isoparaffin Uses Thickener, emulsifier, stabilizer for industrial applies., highly acidic aq. gels (toilet bowl cleaners, pickling pastes), d-limonene emulsion degreasers, min. spirit emulsion degreasers thickener for soivs. producing anhyd. gels, e.g., paint strippers... 

For these reasons it is important that stainless steel pipework and other process fabrications are thoroughly cleaned, particularly at the welds to ensure the passive surface oxide film can form. This is normally achieved by washing the surface with an acidic pickling paste or liquid (usually a mixture of chromic and nitric acids), to achieve a chemically clean surface on which the protective passive layer can form. 

Fabricated articles are less commonly hot-dip aluminised now than in the past. Coatings are applied after cleaning the work, e.g. pickling in hydrochloric acid in the case of steel and then preheating. The work is then immersed in a molten salt bath, a flux or reducing atmosphere, prior to... 

Many bacteria perform services we find useful and even necessary, although we rarely take note of them. Some bacteria participate in the decomposition of dead plants and animals and so help recycle chemicals that are otherwise locked away from the living world. Some are sources of antibiotics that have revolutionized the treatment of infectious disease in the past fifty years. Others are responsible for nitrogen fixation, converting relatively inert atmospheric nitrogen into biologically useful ammonia—a conversion that is not simple in the chemical laboratory. Still other bacteria are indispensable in the world s kitchens, for without them there would be no cheese or yogurt, nor any of hundreds of other traditional milk products. We could not enjoy pickles or sauerkraut, and... 

Pickle plant conveyors Paste Hot alkali, hot acid... 

Trimethylamine has long been known to exist in the pickle in winch herrings have been preserved. More recently it has been found to be an important product of putrefactive changes iu fish, starch-paste, brain-tissue, muscular tissue, and other albuminoid substances, being accompanied by lesser quantities of monomethylamine, dimethylaminc, ethylamine, and diethylamine, as well as by other peculiar alkaloidal bodies. It has also been observed accompanying more active alkaloids in blood-serum, etc., which have served for the culture of various bacilli. (See choline and heurine, below, and ptomaines, p. 343.)... 

North and Mediterranean Seas and the Atlantic Ocean. It is a fatty fish (cf. Table 13.5), which is marketed salted and dried, smoked, or canned in edible oil, brine or tomato sauce. Tuna meat is also a common delicatessen item (tuna paste, sausages, rolls, etc.). The Atlantic mackerel Scomber scombrus) is of great importance, as are the chub or Pacific mackerel S. japonicus) and the blue Australian mackerel S. australa-sicus). Mackerel are sold whole, gutted or ungutted or filleted, frozen, smoked, salted, pickle-salted (Boston mackerel), etc. 

Tomato Lycopersicon lycopersicum Solanaceae The reddish pulpy berry is eaten raw, in salads, cooked as a vegetable, used as a paste or seasoned puree immature green tomatoes are pickled and then eaten as salad... 

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