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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Analysis of contact points from a Remy 12-cylinder ignition set, identifying a platinum-gold alloy.

Identifier  ExFiles\Box 35\5\  scan 043
Date  21th August 1918
  
X2894
EFC. 21.8.18.

X.2894 - RE CONTACT POINTS FROM REMY 12 CYLINDER IGNITION SET X.2814.X.1818.

These points were not attacked by acids and submitted to treatment only after being attacked by aluminium.

They appear to be a platinum-gold alloy with traces of the rarer metals as impurities.

The approximate analysis is

Au. 75%
Pt. 25%

Tests were difficult owing to small quantity of alloy available. HCH.
  
  


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