Show EVEN SILK IS adulterated cannato of tin and silica to give it weight some improvements in the treatment of silks are announced ordinarily silk is weighted by depositing of tin on the liber the receives a bath of tannic acid and then another cf of tin a repetition of this being made until an increase of the weight amounts to from 15 lo 10 20 per cent beyond which it is not considered safe to go in the case of silk intended to be dyed light shades or to lie bleached a german inventor hn brought forward a process in which silica is the weighting agent ial tarrying out this method says the lie troit news tribune three are described first the silk raw or in any faitage of manufacture and either beffre or after dyeing is worked for an hour in a bath of of tin then after squeezing and washing it is worked in a warm solution of water glass or soluble silicate of boda or hour followed by washing having also been previously passed through a solution of phosphate of soda the operation may be repeated again and again with no harmful effect on the fiber or anth e subsequent dyeing and in five operations the silk may be increased in weight some aioo to per cent the silk is now soaped and if already dyed is cleared in an emula aion of oil and acid |