| Lustra-celluloses: | |
| Chardonnet | 33.70 |
| Lehner | 26.56 |
| Pauly | 1.61 |
18. Inorganic constituents.—Determinations of the total ash gave for the first five of the above, numbers varying from 1.0 to 1.7 p.ct. The only noteworthy point in the comparison was the exceptionally small ash of the Pauly product, viz. 0.096 p.ct.
19. Total nitrogen.—The natural silks contain the 16-17 p.ct. N characteristic of the proteids. The lustra-celluloses contain 0.05-0.15 p.ct. N which in those spun from collodion is present in the form of nitric groups.
The points of chemical differentiation which are established by the above scheme of comparative investigation are summed up in tabular form.
Methods of dyeing.—The lustra-celluloses are briefly discussed. The specific relationship of these forms of cellulose to the colouring matters are in the main those of cotton, but they manifest in the dye-bath the somewhat intensified attraction which characterises mercerised cotton, or more generally the cellulose hydrates.
Industrial applications of the lustra-celluloses are briefly noticed in the concluding section of the book.
FOOTNOTES:
[3] With these products it is easy to observe that they have a definite fusion point 5°-10° below the temperature of explosion.