tarnishes

It tarnishes in a day or two, even in dry air, and in contact with moist air it breaks up like ordinary lime.

It tarnishes more easily and inflames less easily than cerium.

Such a man ought to be cautious how he tarnishes his lineage with unjust or ungenerous sentiments.

Exposed to the air, it tarnishes rapidly, a straw-coloured oxide making its appearance on the surface.

It is unalterable in the air for a long time, but at length it tarnishes and presents a greyish-white, half metallic color.

It tarnishes upon exposure to the air and under water, and falls into a powder.

Upon being exposed to the air, it tarnishes only by admixture with other metals, turns grey on the surface, and loses its lustre.

If any great disgrace ever tarnishes the proud name of Sairmeuse, think of Jean Lacheneur.

Even if silverware is not used, it tarnishes, especially in towns, because there is so much sulphureted hydrogen in the air.

It tarnishes, though not so easily as copper; but a coat of varnish will protect it till the varnish wears off.