Shade standards and tolerances have been developed on cloth, wool, cotton-filled gabardine for three shades: Sage Green 522, OD 7 A, and Blue 32^. Standard formulations, based on premetallized dyes, were developed for the wool component of the Sage Green 522 and OD 7A shade. The formulation for the wool component of the Blue 324 shade was derived from that for Blue Qk using chrome dyes, but it was necessary to use one wool primary dyed with wool-type vat dyes. For the cotton component of the fabric, the formulation selected for each shade was that most exten¬sively applied in industry.nArtificial-light characteristics are in harmony with the daylight appearance. However, for the OD TA shade, the shift was slightly to the red when compared to a cotton vat-dyed OD 7A used as the standard of reference. This was a compromise for the improved colorfastness provided by the premetallized formulation used. The colorfastness achieved in all three shades is the highest degree possible with existing colorants. The standard and tolerances were developed by using the standard 3-primary system used by the Quartermaster Corps for shade standardization of wool-type fabric shades, and the whole procedure was monitored by both visual and colorimetric measurement. The spacing of the tolerances visually is considered to be the maximum permissible for the intended end-use and at the same time sufficiently spaced to permit a good acceptance record for production from industry.
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