Abstract
The effect of light rays of different wave lengths upon certain unweighted and weighted silk fabrics is discussed. Specimens of each silk were exposed to the entire spectrum given by an S-1 Sun Lamp and to limited regions of the spectrum. Glass filters were used to filter out the undesired rays. Tensile strengths of specimens after exposure to light rays were compared with those before exposure in order to determine the deterioration taking place.
X-ray diffraction patterns of the silks were made. Lead-weighted silk gave a typical powder pattern; 50 % tin-weighted silk gave slight evidence of fibreing; 43% tin-weighted gave a much stronger fibre pattern. Diagrams of the unweighted silk before exposure to the light source and after exposure to the entire spectrum appeared similar, but photometric analysis indicated that exposure of silk to light results in a decrease in fibre orientation causing the long fibre are to expand toward the character of a powder pattern.
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