The VAT method, for example, can be used to dye wool with onionskins.

比如，在染缸中的方法可以用在将羊毛染成洋葱皮染色的过程中。

youdao

The wool needs to be carded before we dye it.

羊毛在我们染色之前需要被梳理一下。

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The result showed the humic acid, which was environmental friendly dye, was suitable for the dyeing of wool yarn.

实验结果表明：腐植酸作为一种天然环保型染料可用于羊毛纱线(蛋白质纤维)的染色。

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The vat method,for example, can be used to dye wool with onionskins.

VOA: special.2010.08.02

So this week, we describe a natural way to dye wool.

VOA: special.2010.08.02

Now heat the dye for about forty-five minutes or until the wool is the desired color.

VOA: special.2010.08.02