1. None of the plants (of which indigofera tinctoria is the chief) contain the colouring matter in the free state, ready-made, so to say, but only as a peculiar colourless compound called indican, first discovered by Edward Schunck.
没有任何植物（其中以木蓝indigofera tinctoria居首）载有游离状态的，也可以说现成的染料的，但只有称为糖苷的一种特殊的无色化合物，首先发现了爱德华 Schunck 。