There may still be some ignition or explosive powder left in them.

因为可能放过之后还是会有一些能够点燃或会爆炸的粉末存在。

youdao

The results show that the measurement technique can be fairly well used to study the quick reaction behaviours of aluminized explosive powder.

研究表明：本文的光谱技术可以很好地研究粉状合能材料的快速反应特性。

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The method, equipment and mechanism of explosive compaction of metal powder are discussed, and the application to the synthesis of intermetallics and diamond are introduced.

本文讨论了金属粉末爆炸压制工艺方法、装置和机理，同时介绍了该工艺在金属化合物、金刚石等合成领域的应用。

youdao

The rest is likely to be less-explosive powder intended to produce color effects.

WSJ: Latest Boston Charges Point to Fireworks Link

According to the criminal complaint, police were called to a Texas residence on Tuesday where they discovered bomb-making components including a galvanised metal pipe, fuse, lighter and explosive powder in bags.

BBC: Texas fertiliser plant blast: Criminal probe launched

The discovery of fireworks in the backpack is significant because the FBI found that the bombs were believed to contain a "low explosive powder extracted from commercial fireworks, " according to an FBI lab analysis reviewed by The Wall Street Journal.

WSJ: U.S. Charges Three More in Boston Marathon Case