AATCC  Gray Scale for Color Change

     This scale is used in visual evaluation of the changes in color of textiles resulting from colorfastness tests. The colorfastness grades of the scale steps and the corresponding total color differences and tolerances used are determined by the CIE Lab(CIELAB) formula. Colorfastness grade 5 is represented on the scale by two reference chips mounted side by side, neutral gray in color and having a Y tristimulus value of 12 ± 0.2. Colorfastness grades 4.5 to 1, inclusive, are represented by reference chips like those used in Step 5 paired with lighter neutral gray chips of similar dimensions and gloss. Scale features 3 languages; English, Spanish, and Chinese.  Specific tolerances and instructions for use of the scale are given in AATCC Evaluation Procedure 1 which is included in the purchase of a Gray Scale for Color Change.

AATCC  Gray Scale for Staining
    This scale is used in colorfastness tests for evaluating staining on undyed textiles. The scale consists of pairs of nominally white and gray color chips each representing a difference in color or contrast (shade and strength) corresponding to a numerical grade for staining. The fastness grades of the scale steps and the corresponding color difference and tolerances are determined by the CIE Lab (CIELAB) formula. Fastness grade 5 is represented on the scale by two identical white reference chips mounted side by side, having reflectance of not less than 85 percent. Fastness grades 4.5 to 1, inclusive, are represented by a reference white chip identical with those used for grade 5 paired with similar but neutral gray chips. Scale features 3 languages; English, Spanish, and Chinese.  Specific tolerances and instructions for use of the scale are given in AATCC Evaluation Procedure 2 which is included in the purchase of Gray Scale for Staining.

AATCC 標準灰卡，用于評估色牢度測試中的變色、沾色，分1.5級，半級遞增，裝于包裝套內。