Some jobs can leave fingernails blue. Mechanics sometimes get them because of the oxalic acid sometimes used to clean radiators. People who use metal cleaners, paint removers, or who manufacture inks or dyes may also develop blue nails.
That means tucking away fuel hoses, electrical wires and control cables, while water-cooled engines are often styled like air-cooled lumps, with faux fins and machined cases, and radiators cunningly hidden behind frame rails or subtle covers. The naked sector has always been popular, from the ...