Accelerated tests for the settling of pigments in paints / by Sidney Werthan and R.H. Wien.
A 1930 technical report by Sidney Werthan and R.H. Wien, published by the New Jersey Zinc Company, on how fast pigments settle out of paint under accelerated test conditions. Its photographs show sealed glass jars of paint samples lined up for comparison and a laboratory apparatus, which a designer might find useful as a plain record of controlled comparative testing with clear labels and even lighting.
