The determination of color can be carried out by visual (human) inspection or by using a
color measuring instrument. Although human inspection
is quite robust even in the presence of changes in illumination,
the determination of color is in this case, subjective
and extremely variable from observer to observer. In order
to carry out a more objective color analysis, color standards
are often used as reference material. Unfortunately,
their use implies a slower inspection and requires more specialized
training of the observers. For there reasons it is
recommendable to determine color through the use of color
measuring instrumentation.