A few per cent of the initial weight remained as a white residue and was classified as ash.

数%的初始重量仍然作为一个白色残留物和被列为灰。

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White residue remaining after cleaning circuit board assemblies can be caused by a variety of chemicals and reactions.

印刷电路板组装清洗后，常常留有许多白色残渣，这些残渣由许多的化学物反应而成。

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The author explains how chitosans can be used in deodorant formulations to offer good feel and efficacy without producing white residue or skin irritation.

阐述了脱乙酰壳多糖使用于除臭剂配方中能提供良好的感觉和效果，不产生白色残留物和皮肤刺激性，且解释了其原因。

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But the precious metal is not just underground, it's also in the "tailings" - heaps of grey-white residue left behind by old mining activity.

BBC: Golden opportunity for old Indian mines

They say that the results showed levels of residue consistent with it being from white phosphorus.

BBC: Burma police 'used white phosphorous' on mine protesters