3. Platina and copper. These two metals unite with difficulty by a strong heat and form a malleable alloy. This alloy has been preferred for specula for telescopes, as it is hard, polishes well, and is not liable to tarnish. Lewis.
4. Platina and iron. Platina and soft or pure iron do not seem to be easily combined by heat, by reason of the infusibility of iron. But it combines with cast iron and steel by heat. The alloy is very hard, and in some decree ductile when the iron forms ¾ of the alloy. ibid.
5. Platina and tin. Equal parts of platina and tin unite by fusion, and form a dark coloured brittle alloy. But when the platina falls short ⁷/₉ of the alloy, the ductility and whiteness proportionally increase. ibid.
6. Platina and lead. These two metals may be combined in various proportions by heat; but the compounds are not stable, part of the platina falling down, when the alloy is subsequently melted. ibid.
7. Platina and zinc. Platina may be combined with zinc, by being exposed to the fumes of the metal as reduced from its ore. Three parts of platina become four of alloy. It is hard, brittle, of a blueish white colour, and easily fusible. ibid.
8. Platina and bismuth. Platina and bismuth combine readily in a high temperature in almost any proportions. The alloys are brittle. ibid.
9. Platina and antimony. Platina easily combines with antimony by heat. The alloy is brittle. ibid.
10. Platina and arsenic. When white oxide of arsenic is projected upon strongly heated platina, an imperfect union takes place with a partial fusion of the mass; it is brittle, of a greyish colour and a loose granulated texture. Lewis.
Alloys of Silver with other Metals.
1. Silver with mercury. [See amalgams].