The Materials Used in Sizing: Their Chemical And Physical Properties, And ...
The Materials Used in Sizing: Their Chemical And Physical Properties, And ...
W F a Ermen
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Normal HCl = "017 grammes NH3 = -045 grammes H.CHO. Digitized by VjOOQIC CHAPTEE V ANALYSIS OF SIZED WARPS AND CLOTH Before the quantitative analysis of a sample of sized cotton can be undertaken it is necessary to discover the nature of the ingredients that have to be estimated. The sample is shaken with cold water and the solution filtered. The filtrate may contain — Dextrin. Glucose. Glycerine. Sulphates and chlorides of Zinc, Calcium, Magnesium and Sodium. Phenol, and other organic antisept...ics. The sample is boiled with water and the solution filtered. The filtrate may contain — Starch. Gums. Gelatine or Glue. Soap. Casein. Another portion of the sample is burnt. The ash may contain — China clay. The mineral salts already Barium sulphate. enumerated. Cold Water Extract. — Add a drop of iodine solution. A blue, purple or brown colouration indicates dextrin. The more the colouration tends towards brown, the more highly converted was the dextrin employed. Digitized by VjOOQIC ANALYSIS OF SIZED WAEPS AND CLOTH 77 To another portion of the extract add ammonium chloride, ammonia and ammonium sulphide.
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