It preserves its lustre in dry air, but in moist air it becomes tarnished by the formation of a film of oxide.
When not tarnished, the mineral has a silver-white colour with a tinge of red, and the lustre is metallic. Hardness 2-21; specific gravity 9-70-9.83.
Such restorations are possible because of the intimate fitness of animals and plants to their environment, and because such fitness has distinguished certain forms of life from the Cambrian to the present time; the species have altogether changed, but the laws governing the life of certain kinds of organisms have remained exactly the same for the whole period of time assigned to the duration of life; in fact, we read the conditions of the past in a mirror of adaptation, often sadly tarnished and incomplete owing to breaks in the palaeontological record, but constantly becoming more polished by discoveries which increase the understanding of life and its all-pervading relations to the non-life.
Gabriel thought back to the three items he'd discovered in her jewelry box: the compass, a soul and the tarnished ring he gave her hundreds of years ago.
His fame is tarnished, however, by numerous deeds of tyranny and cruelty.
An absolutely clean surface becomes tarnished in damp air, an almost invisible coating of oxide being produced, just as happens with zinc; but this film is very permanent and prevents further attack.
Others submitted or temporized; but before there had been time enough for the matter to be carried through, the emperor died, having tarnished if not utterly forfeited by this last error the reputation won by a life devoted to the service of Orthodoxy.
When exposed to the air it becomes quickly covered with a film of oxide; the tarnished metal when plunged into water reassumes its metallic lustre, the oxide film being quickly dissolved.
He was perhaps wanting in firmness of character, and the undue influence exercised over him by unscrupulous ministers, or by the seductions of fairer but no less ambitious votaries of statecraft, led him to make concessions which tarnished the glory of his reign, and were followed by baneful results for the welfare of his empire.
It is, however, to be regretted that this monarchs memory is tarnished by more than one dark deed.
Lead exposed to ordinary air is rapidly tarnished, but the thin dark film formed is very slow in increasing.
The colour of the mineral is silver-white or steel-grey, with a metallic lustre, but it is often tarnished yellow; the streak is greyish-black.
Wohler reduced the sesquioxide by zinc, and obtained a shining green powder of specific gravity 6.81, which tarnished in air and dissolved in hydrochloric acid and warm dilute sulphuric acid, but was unacted upon by concentrated nitric acid.
To describe ending hunger in the future, I have only these tarnished terms of the present at my disposal.
Besides the premiership, Depretis assumed the portfolio of finance; Nicot~a, an ex-Garibaldian of somewhat tarnished reputation, but a man of energetic ~~t~ and conservative temperament, was placed at the ministry of the interior; public works were entrusted to Zanardelli, a Radical doctrinaire of considerable juridical attainments; General Mezzacapo and Signor Brin replaced General Ricotti Magnani and Admiral Saint-B on at the war office and ministry of marine; while to Mancini and Coppino, prominent members of the Left, were allotted the portfolios of justice and public instruction.