Cellulose

Cover Cellulose
Cellulose
Bersch, Josef, 18840- [from Old Catalog]
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In describing the manufacture of artificial silk according to Chardonnet's method, attention has been drawn to the great care bestowed upon the production of nitro-cellulose which is completely soluble, and collodion-cotton possessing this property being also required for the manufacture of celluloid, the reader is referred to the process used by Char- donnet. When a freshly-prepared quantity of collodion- cotton is to be worked, it is, in all cases, advisable to test a sample of it as to its s
...olubility. For this purpose a small quantity of the collodion-cotton is thoroughly dried. One gramme (15.43 grains) of the dry mass is brought into a large test-tube and 200 cubic centimeters (12.2 cubic inches) of ether are poured over it. Solution is hastened by con- tinued shaking, and the test-tube is then placed perpen- dicularly in a place protected from shocks.
In the course of 24 hours, the contents of the test-tube should form a clear, transparent fluid, which is a proof of the entire quantity of collodion-cotton having been dis- solved in the ether.


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