Image analysis, ERIC and ISO Brightness
measurements were used to evaluate the
effectiveness of laboratory deinking
assays. The accurate measurement of the
residual ink amount is difficult and the
results depend on the methodology used.
The three techniques correlate only when
the same paper pulp sample is analysed
and when the ink particle size distribution
profile is similar. As the relative amount of
each particle size depends on the deinking
protocol used, the ink removal effectiveness
is measured differently according
to each test method. Image analysis was
shown to be the most reliable method
