大毘盧遮那成佛經疏 14.45

14.45

復次行者須知諸字之色，謂初阿字及迦等二十五字，及也囉乃至訶字，皆屬於阿，作其黃色，所謂金剛之色也。第二阿字轉作黃白色，所謂寂靜色也。阿字體黃，三昧為白，二色合故黃白也。第三加頭上點者亦作黃白色，暗也。阿字黃，大空白，故黃白也。次第四惡字轉作黃黑色，阿字黃，二點涅槃色黑，故黃黑也。亦可二點是降伏義，猶如涅槃壞滅摧破一切障法，此亦如是，故二點作黑也。第五噁字者，阿字體黃，上點即白，傍即黑，當知即是種種雜色也。

Furthermore, the practitioner must know the colors of the syllables. The initial syllable A, the twenty-five syllables beginning with Ka, and the syllables from Ya and Ra up to Ha all belong to A and are made yellow, which is the color of the vajra. The second syllable Ā is turned into yellow-white, which is the color of quiescence. The essence of the syllable A is yellow, and samādhi is white; because the two colors combine, it is yellow-white. The third, with a dot added to the head, is also made yellow-white, which is Aṃ. The syllable A is yellow and great emptiness is white; therefore it is yellow-white. Next, the fourth syllable Aḥ is turned into yellow-black. The syllable A is yellow and the two dots are the color of nirvāṇa, which is black; therefore it is yellow-black. It may also be that the two dots mean subjugation: just as nirvāṇa destroys and smashes all obstructive dharmas, this is also like that; hence the two dots are made black. As for the fifth syllable, Aḥ: the essence of the syllable A is yellow, the dot above is white, and the sides are black; one should know that it is of various variegated colors.