Chemistry of the household . ith bleaching best substance to use for this is hypo-sulphite ofsoda, the hypo used in photography, which is quiteharmless to the cloth. Sulphur Chlorine cannot be used in bleaching fabrics of ani- Bieiching ^^^^ ^hvQ such as wool and silk; it leaves them yellow rather than white. For these the fumes of burning sulphur, or these fumes dissolved in water must be BLEACHING. 83 used. No special means of destroying the excess ofsulphur fumes is required. These fumes are a com-pound of sulphur and the oxygen of the air and famil-iar to every one, in the acid
Chemistry of the household . ith bleaching best substance to use for this is hypo-sulphite ofsoda, the hypo used in photography, which is quiteharmless to the cloth. Sulphur Chlorine cannot be used in bleaching fabrics of ani- Bieiching ^^^^ ^hvQ such as wool and silk; it leaves them yellow rather than white. For these the fumes of burning sulphur, or these fumes dissolved in water must be BLEACHING. 83 used. No special means of destroying the excess ofsulphur fumes is required. These fumes are a com-pound of sulphur and the oxygen of the air and famil-iar to every one, in the acid fumes from a burningsulphur match. The article to be bleached must bewet, and then hung in some enclosed space above apiece of burning sulphur. The sulphur candles, to behad at any druggists, are convenient for this 20. The fumes have great affinity for oxygen,that is, unite with it easily, and take it from the color-ing stuffs, converting them into colorless ones. Thismethod of bleaching is sometimes not FIG. 20. A SULPHUR CANDLE. These fumes of sulphur are often used to disinfectrooms where there has been sickness. Its power inthis respect is far less than is generally supposed how-ever, and much larger quantities of the gas are re-quired for thorough work than are commonly gas is an excellent disinfectant, but is dan-gerous to use because of its irritating effect upon thethroat and lungs. The use of chloride of lime as adisinfectant depends upon the fact that chlorine slowly 84 CHEMISTRY OF THE HOUSEHOLD. escapes from this substance when it is exposed to theair. Hydrogen Another bleaching agent of growing importance Peroxide -^ pej-Qxide of hydrogcn. Water is a compound madeup of one-third oxygen and two-thirds hydrogen. Un-der certain conditions, a compound half oxygen andhalf hydrogen may be prepared. This is not verypermanent as the extra oxygen slowly escapes. Thisextra oxygen has great power as a decolorizer. Theperoxide is a liquid mu
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