8. Gold with lead. The effect of uniting even a very small proportion of lead to gold is remarkable. When the alloy contains ¹/₂₀₀₀ part of lead, it is brittle like glass. The vapour of fused lead in close vessels is sufficient to injure gold. ibid.
9. Gold and zinc. These two metals combine in almost any proportion. When 11 parts gold and 1 zinc are alloyed, the compound is of a pale greenish yellow like brass, and very brittle. Equal parts of these metals form a very hard, white alloy, susceptible of a fine polish. ibid. & Hellot.
10. Gold and bismuth. Gold unites with bismuth, but the colour is injured and the ductility of the alloy destroyed by a very small portion of the latter metal, the same as with lead. ibid.
11. Gold and antimony. These metals combine and produce a brittle alloy, much of the same kind as those with bismuth and lead. ibid.
12. Gold and arsenic. There seems a considerable affinity between gold and arsenic, but the volatility of arsenic in the fusing temperature of gold renders it difficult to bring them into contact. A very small proportion of arsenic makes the alloy brittle, and this property increases with the arsenic. Hatchett.
13. Gold with cobalt. These unite and form a brittle alloy, even when the cobalt only makes ¹/₆₀ of the compound. ibid.
14. Gold and manganese. Gold and manganese may be united, and the alloy is very hard and less fusible than gold. One alloy was found to consist of 7 or 8 parts of gold and 1 of manganese. ibid.
Alloys of Platina with other Metals.
1. Platina and silver. It does not appear very clear that these two metals combine by fusion; at least if they do, the difference in their specific gravities is sufficient to overcome their affinity.
2. Platina and mercury. [See amalgams].