the the table below and are also depicted in the graphical representation of fig1 the column headed 34 u03b4l 34 shows the color difference between the treated ppd t and the control ppd t note that the runs of this example were conducted on polymer made on three different occasions and that as a consequence the color of the controls is slightly different from batch to batch ______________________________________batch sequestering agent color l u03b4l______________________________________i none control 73 2 0 03 75 1 1 9 0 75 78 6 5 4 3 00 78 5 5 3ii none control 68 2 0 15 76 5 8 3 0 30 75 8 7 6 0 45 76 9 8 7 0 75 76 8 8 6 3 00 77 1 8 9iii none control 68 0 0 03 69 1 1 1 0 06 71 9 3 9 0 09 72 1 4 1 0 12 76 7 8 7 0 15 70 8 2 8 0 75 78 1 10 1 0 75 80 3 12 3______________________________________ in this example the procedure of example 1 was followed with the exception that the ph of the initial slurry was adjusted to have different values for different runs results of the several runs are shown in the table below and are also depicted in the graphical representation of fig2 the amount of sequestering agent was maintained at 0 75 based on polymer weight the control was ppd t maintained at ph 6 with no sequestering agent treatment ______________________________________ph color l______________________________________ 6 control 69 0.