釋氏要覽 1.281

1.281

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).