26 May 1988
Clean to remove tarnish, part of trials with ZnO.
Slightly tarnished, old lacquer. Req no 35437
Washed in acetone applied on swabs. Gently polished using cotton wool. Washed in 2% Synperonic N (non ionic detergent,nonylphenol ethylene oxide condensate). washed in warm water. Dried using paper tissue.