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 A
further stage of analysis will involve the identification
of individual pigment particles perhaps using a polarising,
or a scanning electron microscope. This will often provide
information on the age, finish and purpose of a particular
layer.
The presence of chrome yellow will usually indicate that
a decorative scheme could not have been applied before ca.1820,
for example. Other useful datum points are suggested by the
first occurrence of emerald green (1814+), lithopone (1870s+)
and titanium (1920s+).
A combination of documentary and pigment analysis can often
enable the identification of the scheme that was visible at
any particular period in time. This might be the years during
which a notable individual lived in the house, or even when
a specific event took place there.
The interpretation of such analysis can only be done by someone
who has made a study of the house-painter's methods and materials.
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