Pumice stone

Enzymatic desizing is one of the oldest nonfood appHcations of commercial amylases. Another type of enzyme, microbial ceUulases, has developed within the textile iadustry as a tool for fabric finishing, ia particular for denim garment finishing. CeUulases can achieve the fashionable worn look traditionaUy obtained by the abrasive action of pumice stones, ie, stone-washing. 

Stone-washing is carried out by lightweight pumice stones that are put into industrial laundry machines with the jeans. The stones mb against the denim and remove some of the dye. However, too much abrasion from stones can damage the fabric, particularly hems and waistbands. 

Bixnsstein, Bimstein, m. pumice stone, pumice, bimsstein-ahniich, -artig, a. pumiceous. Bimssteinseife,/. pumice soap, bin, pT. 1 sing, (of sein) am. binar, a. binary. 

Schwemm-land, n. alluvial land, -stein, m. a kind of porous brick made from clay and gravel, porous concrete block pumice stone, -verfahren, n. flotation process, -wasser, n. wash water flushing water. 

The reactor consists of a cylindrical tube 59 cm long packed with pumice stone. The catalyst charge was constant in all of the runs below and equal to W. The reactor void volume was approximately 100 cm3. The reaction is believed to be first-order in ethylene chloride under the conditions of this study and in all cases the feedstock was pure reactant. Both the reactants and the products are gases at the conditions involved. Ideal gases may be assumed. The following data were reported at 600°C and one atmosphere. 

A gas suspended in a solid is also called a foam. This form of colloid is relatively rare in nature, unless we stretch our definition of solid to include rock, in which case pumice stone is a colloidal foam. Synthetic foams are essential for making cushions and pillows. There is also presently much research into forming metal foams, which have an amazingly low density. 

Q89 to rub the surface gently v/ith a file or pumice stone daily... 

It is important to check that a patient presenting with a foot problem does not have diabetes. Diabetic patients are at an increased risk of developing infections because of injury from the keratolytic action of salicylic acid. Patient should be advised to apply petroleum jelly to the skin surrounding the area where salicylic acid will be applied. Petroleum jelly protects the skin from the irritation caused by the salicylic acid. Using a file or pumice stone to gently rub away the surface of the corn or calluses helps to remove them. 

Hydrogen selenide may be synthesized directly from elements by heating at elevated temperatures. It is prepared by heating hydrogen at 440°C with either selenium metal in a sealed tube or with selenium vapor over pumice stone ... 

The Stockholm papyrus (third or fourth century A.D.) gives the following recipe for preparing verdigris for making artificial emeralds Clean a well-made sheet of Cyprian copper by means of pumice stone and water, dry, and smear it very lightly with a very little oil. Spread it... 

The reaction can be illustrated by the apparatus shown in Fig. 7. Air is forced from a gas holder through a wash-bottle containing hydrochloric acid, and then through a hot porcelain tube containing pumice-stone impregnated with a soln. of cupric chloride and dried The chlorine gas obtained at the exit can be collected in the usual manner. It is, of course, mixed with the excess of air, nitrogen, etc. 

H. Erdmann s apparatus for preparing hydrogen chloride in a Kipp s apparatus is illustrated in Fig. 9. The middle bulb of the Kipp s apparatus contains pumice stone the upper and lower bulbs contain hydrochloric acid the upper end of Kipp s apparatus is closed by a rubber stopper fitted with a bulb containing potash lye. The separating funnel contains cone, sulphuric acid, and it leads to the inner bulb via a trap A containing sufficient mercury to cover the opening of the down-tube from the separatory funnel. Otherwise the diagram explains itself. A wash-bottle can be fitted to the exit tube B in the ordinary way. 

With pumice-stenc, forge-scoria, chalk, and a little soda In proper proportions, bottle-glass might therefore be made. Basalt would require only the addition of a little chalk and soda. Pitchstone treated like pumice-stone would furnish it also-... 

In the manufacture of chamois leather the skins are prepared by passing through the lime vats, scraping on the home, et cetera, in the ordinary way and when these preliminaries are effected, and the lime removed in the lactic acid or bran vat, ns muc]i as possible, they are subjected to the frizing operation. This consists In rubbing them with pumice-stone, or the blunt end of a round knife, till the grain Is entirely removed, the surface softened, and an equal thickness obtained throughout. After this the skins are squeezed or pressed, in order to remove as much water as possible. 

Ecarnot passes his gases mixed witli a current of steam from a boiler, and with air supplied by a blast over surfaces of pumice-stone,... 

Pm cine Soap.—Curd soap, fifty pounds cocoa nut oil soap,t ie same quantity, molted to paste and crutched with ten to twenty pounds of finely bolted pumice-stone powder. The perfume is a mixture of attars of thyme, Cassia, caraway, and lavender, each one pound. 

Pumicing, or clearing up the surface frith pumice-stone and water. 

The characteristics of good black asli are as follows —It should be of a blackish-grey color, and with open pores, similar to pumice-stone, so that a liquid may easily penetrate its substance. It slioidd contain from twenty to twenty-four per cent, of available soda, and should be free, or contain only a slight trace of sulphate of soda. When the solution obtained by lixiviating a portion is acidified, merely a faint smell of sulphide of hydrogen should be perceptible. 

Carbon Monosulphide, CS.—This sulphur analogue of carbon monoxide is described as resulting8 on passing carbon disulphide vapour over spongy platinum, pumice stone or red-hot charcoal. It is also formed by the action of the silent electric discharge 7 on carbon disulphide or on a mixture of the latter with either hydrogen or carbon monoxide, thus ... 

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