How to use "powder" in a sentence

"That mustard powder you're just about to put into the salad dressing."

And where it met with water, or even mist or wet grass, a chemical action took place and it turned into a powder that sank slowly and made room for more.

After that, the streets became clear of powder and I passed some white houses which were on fire

Here I found more black powder and some dead bodies

The black powder covered them and softened their shapes

Where there was no black powder, it was curiously like Sunday in the financial area of London, with the closed shops, the houses locked up and the curtains closed

In South Kensington the streets were clear of dead people and of black powder, and near there I first heard the howling

I came into Oxford Street by Marble Arch, and here again were black powder and several bodies

The city we went through was dirty with the powder of the Black Smoke, despite two days of thunderstorms and rain.

At night I see the black powder-darkening the silent streets, and the twisted bodies covered by it