Definition of "unpainted"
unpainted
adjective
not comparable
Quotations
The new cars incorporate many features first introduced in the 1938 tube stock, but major changes include the use of rubber for the bogie bolster and axlebox suspension, fluorescent lighting, and the panelling of the cars in unpainted aluminium alloy.
1960 February, “The first of London's new Piccadilly Line trains is delivered”, in Trains Illustrated, page 93