for the trials the ph being adjusted to 9 defibering was followed by a reaction period of 90 minutes in a water bath at a temperature of 50 u00b0 c the mixture was then diluted to a consistency of 0 8 in a laboratory cell and subjected to flotation treatment for 10 minutes at the end of the flotation treatment the pulp was neutralized with sulfuric acid sheets were made and the degree of whiteness determined the tables below illustrate the whiteness of sheets obtained using different paper varieties r 457 and y c are standard procedures defining whiteness the percentage of ingredients used in each trial is listed below the corresponding table the percentages of each reagent is based on weight percent of the paper added in the table 34 none 34 indicates that only the stabilizer peroxide and fatty acid were used 34 additive 34 means that the stabilizer peroxide fatty acid and additive were used 34 solvent 34 is a comparison run in which a medium high boiling paraffin solvent was used in place of the additive with the stabilizer peroxide and fatty acid ______________________________________trial a flexographic printmaterialadded before flotation after flotation______________________________________ r 457 y c r 457 y cnone 48 0 53 6 48 5 53 5additive a 46 1 51 2 52 2 59 0additive b 46 1 50 9 51 8 57 9additive c 48 0 53 9 54 3 61 90.