Testing for paint opacity, Balm Paints Research at Clayton, Victoria, 1961 [2] [picture] /

Condition: Good.; Title devised by cataloguer from information on verso.; Part of Wolfgang Sievers photographic archive.; Sievers number: 3111AB.; "Balm Paints Research Laboratories, Clayton, Vic - 1961"--Written in pencil on verso.; "C2. A laboratory batch of white paint is tested for opacity by an experienced painter. The paint must cover black squares as perfectly as white squares so that no difference is discernible where the black and white squares meet."--Small typed note attached to back of photograph.; Also acquired as part of collection: Balm Paints, Research Laboratories, Clayton, Melbourne, 1961.; Also available in an electronic version via the Internet at: http://nla.gov.au/nla.pic-vn3971534