Practical dental metallurgy / by Thomas Fletcher.

  • Fletcher, Thomas
Date:
1881
Catalogue details

Licence: Public Domain Mark

Credit: Practical dental metallurgy / by Thomas Fletcher. Source: Wellcome Collection.

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    Faint yellow when hot, white when cold, near to the flame—Tin. Yellow—Lead. Dark orange yellow when hot, lemon yellow when . cold—Bismuth. Brownish red or yellow—Cadmium. Dark red, very slight—Silver. BEHAVIOUR OF METALS IN AIR. Metals. At ordinary temperatures. Dry air. At ordinary temperatures. Moist air. At high temperatures. Aluminium ... No change Slowly tarnishes Burns, forming Al2 O3 Bismuth No change Slowly tarnishes Burns to Bi2 O3 Cadmium No change in air free from car- bonic acid No change in air free from car- bonic acid Burns to Cd 0 Copper No change Tarnishes Burns to Cu 0 Gold No change No change No change Platinum ? > > > J > Palladium J * >> Oxydizes at low red. Oxide is reduced again at higher tem- peratures Lead Tarnishes Tarnishes Burns to Pb 0 Mercury No change Slowly tarnishes Burns to Hg 0 Nickel No change No change Forms Ni 0 Silver Blackened if sul- phuretted hydro- gen is present Blackened if sul- phuretted hydro- gen is present No change Tin No change No change Forms Sn O2 Zinc Tarnishes Tarnishes Burns to Zn 0
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