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1 Examine the sample of material submitted for identification. ), color, fiber length and fineness, uniformity of appearance and probable end-use. If the sample is a fabric, separate out yarns by unraveling or cutting. If the fabric is woven, separate warp and filling yarns. If yarns differ in color, luster, size or other apparent ways, make a physical separation of these yarns for separate identification. 2 The fibers may be identified using either light or scanning electron microscopy. If using transmitted light microscopy, place a small quantity of the fibers on a glass slide, tease fibers apart, mount with a drop of mineral oil or other immersion fluid, cover with a cover slip and examine under the microscope.

Although the exact cause of this difference in color may not be known, it should be noted in the report when it occurs. 16 In some cases high humidity, in combination with atmospheric contaminants, has been found to produce color changes as great as those produced by light. When requested, prepare a duplicate set of test specimens and standards mounted on cardboard, but not masked, and expose simultaneously in another cabinet of the same type used in the light exposures but with the glass covered with an opaque material so that the light is excluded.

4 Graduated cylinders, 500 mL. 5 Bulb pipette (or aspirator), 100 mL. 6 Bulb transfer pipettes, assorted sizes. 3). 4). 9 Graph paper, log-log. 6. 0 g of agent per liter unless the solubility is so poor that less must be employed. The wetting agent is first thoroughly dissolved in about a quarter of the necessary distilled water at a temperature above 80°C and is then diluted to the final volume with cold distilled water. 00 g of wetting agent per liter. This range of concentrations is sufficient for the study of any commercial product.

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AATCC Technical Manual by American Assoc. of Textile Chemists and Colorists

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