"Riveted joints exposed at Singapore for 180 days; duralumin interface."

A copy negative made by the Portsmouth Dockyard Photographers of a photographic print showing eleven different riveted plates, each numbered and each coated with a different substance. The photograph has the title "Riveted Joints exposed at Singapore for 180 days. Duralumin interface." The plates are 4A zinc oxide paint; 1A barium chromate paint; 10A red iron oxide paint; 13A red lead paint; 21A chromium oxide paint; 23A mixture of shellac, compound no. 3 and marine glue, compound no. 1; 9A shellac, compound no. 2; 16A marine glue, compound no. 1; 31A seaplane varnish (2X17); 25A boiled linseed oil; 28A gutta percha.