A peek into someone's kettle will reveal either a clean element or one coated with a white, chalky substance, depending on the local water type.

The chalky substance is also used in uli design, created and exhibited on the skin of Igbo women.

Years ago they were the sources of caliche, a chalky white substance mixed with gravel and sand and used on roads throughout south Texas.

He smeared away the chalky substance that gave paleness to his face.

The next room was half again smaller than the first two, with walls and piping all covered with a white chalky substance.

It didn't taste unusual but half way through I noticed a chalky powdery substance at the bottom of the glass.

The basement has never flooded, but a white chalky substance has formed on one section of the wall.

Some parchment (usually poor quality) is smeared with log, a chalky substance, to make it whiter.

There the chalky substance was intact, and its top was flat.

Fortunately, our chemists at the agency lab came up with a chalky substance they could tint that left no aroma.