archil

/ahr-kil/US // ˈɑr kɪl //UK // (ˈɑːtʃɪl) //

拱门,拱桥,拱顶,拱形物

Definitions

n.名词 noun

Archil, r′kil, n. a colouring substance obtained from various species of lichens.
Roccella, rok-sel′a, n. a genus of parmeliaceous lichens, yielding dyers' archil or orchil.
Sometimes a little archil is added to the madder, to give the dye a pink tinge; but this is fugitive.
Its conversion into the archil red is effected by the action of an alkali, in contact with the air.
The soap is coloured with strong alcoholic solution of archil for the rose tint, and of turmeric for the deep yellow.