This is particularly noticeable in the case of
Procion Red MX-5B which displays a marked
increase both in total absorbance and in the ratio
of monomer to soluble aggregate concentration.
The effect was much less marked in the case of
Remazol Red F-3B, with only a small increase in
the ratio of monomer to soluble aggregate species
being observed on addition of 60 g lÿ1 urea.