Prince Bros. Mineral Brown
From PacificNG
"Editor Railroad Paint Shop: We can honestly commend to the careful man the use of Prince Bros. Mineral Brown, which is made exclusively by the Prince Manufacturing Company, has been tried for thirty-eight years and never found wanting, does not contain a trace of sulphur, acid, or any other injurious ingredient. It is the only paint made by the Prince Bros. of this kind." -David Prince, New York.
"Mineral Brown," Railroad Car Journal Vol.VI No.9 September 1896 p222.
Report on the Metallic Paint Ores along the Lehigh River Pennsylvania State Geologist, Annual Report for 1886. Hathi Trust.