130 TEXTILE FABRICS. [ V. 



substance, ozone (singular, because but little understood), seems 

 to possess bleaching properties, and hence we notice it. 



Ozone. — Phosphorus kept in moist air imparts to it the pro- 

 perty of bleaching various vegetable colors, and when kept 

 too long in this air, their texture is weakened, as in bleaching 

 by chlorine. Such air is termed ozonized air by Schonbein, 

 who first investigated its properties, and called the substance 

 itself ozone. A convenient way of making ozonized air is to 

 cover the bottom of a capacious bottle with water, to set in it 

 a stick of phosphorus, which must rise above the water, to 

 close it loosely with a cork, and place it in a temperature of 

 60-68°. The air will be ozonized in the course of an hour, 

 may be used, and fresh ozone obtained with the same ar- 

 rangement. 



Its bleaching effects are due to its large content and loose 

 combination of oxygen, analogous to that of binoxide of hy- 

 drogen, and to that of dilute solutions of chlorine. A color- 

 ing substance is changed in its nature by oxidation, and new 

 colorless compounds formed. Schonbein has further shown 

 its oxidizing effect on protosalts of manganese. By writing 

 with a solution of sulphate of manganese, and putting the 

 dry writing for a short time into a bottle of ozonized air, the 

 writing appears of a brown color, from the formation of per- 

 oxide of manganese. The writing will vanish in sulphurous 

 acid by reduction to protoxide, and will reappear in ozonized 

 air. 



Bleaching Sponge. — After extracting lime by dilute muriatic 

 acid, and washing with water, it is put into very dilute muriatic 

 acid and, a solution of chloride of lime added, after which it. 

 is rinsed in water and passed through an acid bath. It is 

 then put into very dilute sulphuric acid, containing sulphite 

 of soda, thoroughly washed, pressed out and dried. (Kressler 

 in Journ. f. Chem. u. Pharm. Ixiv.) 



Bastick, examining the effect of chloride of lime upon 

 starch, sugar, cotton, &c,, found that when free lime is pre- 

 sent, formiate of lime is produced ; when absent, carbonic acid 

 ie generated. (Journ. Pharm. (3) xiv.) It appears then that 



