The intensity of the colour is a measure of the purity of the product.

颜色的强度是产品纯度的一种量度。

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It is also the colour of purity.

白色也是纯洁的颜色。

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Simulation test of hybrid rice production demonstrated that the purity of hybrid rice would be improved greatly by using leaf colour as a marker to eliminate the false hybrid rice at early stage.

模拟杂交稻生产和制种繁种，表明利用苗期叶色标记结合人工去杂，可有效提高田间纯度。

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