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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).
Laboratory report detailing the chemical analysis of sludge from a crank pin.

Identifier  ExFiles\Box 145\2\  scan0069
Date  30th August 1935 guessed
  
LABORATORY REPORT IN CONNECTION WITH THE SLUDGE FROM CRANK PIN

Soft black deposit containing free metal.

Oil soluble in 40. P.E. 23.5%
Oxidised oil sol. in Benzene 1.4%
Other combustible matter 7.7%
Mineral matter 67.4%
-----
100.0
=====

Mineral matter contains:-

Sand (SiO2) 16.1%
Lead oxide (PbO) 24.8%
Tin oxide (SnO2) 2.5%
Iron and aluminium oxide (Fe2O3) 44.9%
Chromium oxide (Cr{Mr Cra???ster / Mr Chichester}2O3) 4.2%
Lime (CaO) 3.6%
Copper oxide (CuO) trace
-----
96.1%
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