Date of Award
Bachelor of Science
A study of the effect of various minerals salts on dyeings made with direct dyes. Dyes were chosen for their frequency of usage in the paper industry; the salts were chosen for several reasons, the prime one being that they form a floc at approximately the same pH as that of the stock run over the paper machine, also for its cost and availability. Sheets were made with the various dyes and salts in severals percentages of each dried, out up into test sheets for fading and bleeding. The test sheets were examined visually for evidence of fading and bleeding and the results accordingly ware recorded . It was shown by this method that manganese chloride when used in connection with certain dyes improved the light fastness and bleeding resistance.
Bortolotti, Lawrence R., "A Survey of the Effect of Mineral Salts on Direct Dyeings" (1956). Paper Engineering Senior Theses. 92.