orchil.

/awr-kil, -chil/US // ˈɔr kɪl, -tʃɪl //UK // (ˈɔːkɪl, -tʃɪl) //

赭石,赭石市,赭色,兰斯

Definitions

1.
- ›a violet coloring matter obtained from certain lichens, chiefly species of Roccella.
- ›any lichen yielding this dye.

Roccella, rok-sel′a, n. a genus of parmeliaceous lichens, yielding dyers' archil or orchil.
Litmus is also obtained from the same lichens as yield orchil.
Cochineal is turned by the potassa to a violet-red, orchil to a violet-blue, and alkanet to a decided blue.
The acid turns logwood violet to a fine red, and equally reddens orchil violet.
Much orchil was formerly gathered, and there is good pasturage for the numerous herds of cattle.