oil spots, fig. 6
Fig. 6, showing the
characteristic dark boundary and lighter central portion... formed by a quantity of oil too large to form a droplet and which became unevenly distributed over the film surface.
ex G. E. Matthews and J. I. Crabtree,
Oil Spots on Motion Picture Film, paper No. 325 in Abridged Scientific Publications, Research Laboratories of the Eastman Kodak Company. Vol 12 (1928)
17 February 2012