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Soluble Glass

Soluble Glass image
Parent Issue
Day
15
Month
May
Year
1895
Copyright
Public Domain
OCR Text

According to M. Geisenheimer, In the Comptes Rendus, an entirely new departure has lately been made in France in the application of soluble glass to the of linen. In explanation ol this it is stated that, to insure the complete bleaching process, the process arose of increasing the causticity of the lye and prolonging the time of boiling, to the injury of the fabric though improving the color; and though the production of. yellowish or brownish patches on the linen is usually attributed to impurities in the chemical, it is chiefiy due to the presence in the water of calcium and magnesium salts, which are precipitated on the fabrics and act as mordants, fixing the yellowish coloring matter of the lye - an effect preventable by adding to the watei a mixture of sodium carbonate ana soluble g'.ass. Calcium and magnesium silicaté are thus precipitated in a flocculent form which settles rapidly, does not adhere to the fabric, and becomes granular and pulverulent on boiling; and, tluts purified, only a very small quantity of caustic alkali is necessary, the grc.Tter part of the saponiflcation belng eft'PCted by means of the less injurious alkali carbonate. A convenient form in Vhlch to have the soluble glasa for t'nts purpose is said to be obtainab!e by adding from ten to twenty peí cent of anhydrous sodium carbonate to a saturated solution.of the soluble glass

Article

Subjects
Old News
Ann Arbor Courier