釋氏要覽 1.281

1.281

律有三種壞色。謂。青。黑。木蘭。鈔云青謂銅青。黑謂雜泥（即溝瀆中泥）。木蘭即樹皮（此說壞新衣之色也。今云。染色亦無出此三也。今詳禪僧多著墨黲衣若深色者。可是律中皂黑衣攝緣用墨靛與雜泥不遠故若淡而青白者可是律中青衣攝以用銅青板緣雜墨染故）。

The Vinaya specifies three kinds of spoiled colors: blue-green, black, and magnolia. The Commentary states: "Blue-green means verdigris. Black means mixed mud (that is, the mud in ditches and gutters). Magnolia means tree bark" (this refers to spoiling the color of new robes. Now, dyeing colors also does not go beyond these three. Examining this now, Chan monks mostly wear ink-grey robes; if dark, they can be included under the black robes of the Vinaya, since the use of ink-indigo is not far from mixed mud; if light and pale-greenish-white, they can be included under the blue-green robes of the Vinaya, since verdigris plates are dyed with mixed ink).