2 sentences

1. 古人常采涅石作为黑色染料。

   gǔ​rén cháng cǎi niè shí zuò​wéi hēi​sè rǎn​liào.

   Ancient people often used alum shale as a black dye.

   Source: Dong Chinese Dictionary

2. 工匠们用这种天然矿物将白布涅成深黑色。

   gōng​jiàng men yòng zhè zhǒng tiān​rán kuàng​wù jiāng bái​bù niè chéng shēn hēi sè.

   The craftsmen used this natural mineral to dye the white cloth a deep black.

   Source: Dong Chinese Dictionary