This sensitized solution slowly hardens where light strikes it, and these areas remain pliable for several hours.

And if you are successful, and you have a productive economy, the exchange rate will slowly harden.

It hardened slowly, acquiring a silver sheen that blended with the rest of the hull plates.

In the next year, the pulpy wall of each culm slowly hardens.

He gave one last look at the slowly hardening glassy flow in the clearing he had created.

Kirk said nothing, and as the Vulcan noted the blank expression on the ensign's face, he saw it slowly harden to one of stubbornness.

For a very long time, Kirk continued to stare at the captain; but his expression slowly hardened to one of bitterness.

A transformer stricken by the heat gave up the ghost in its fight against gravity and fell into the only slowly hardening molten metal.

In 1903, Wilm discovered that after quenching, an aluminium alloy containing 4% copper would slowly harden when left at room temperature for several days.

Soybean oil is a drying oil, which means that it will slowly harden upon exposure to air, forming a flexible, transparent, and waterproof solid.