3. Results and discussion
3.1. Colour
Based on the objective colour measurements using a chromameter,
the effect of HPP on the three colour variables progressed from strongest
to least for lightness, chroma and hue angle. Using the mixed effects
model, there was evidence that pressure but not duration had significant
effects on tissue colour, and there was no interaction of the effects of
pressure with duration (results not shown). We examined the effect of
time between tissue preparation and HPP treatment and found that
this was not statistically significant (results not shown).