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Whilst a cross section allows one to see the stratigraphy,
each layer has to be exposed in order to determine the colour
of individual schemes. However, this process will only make
sense once a cross section has been made and the sequence
is clearly understood. To carry out a scrape as the sole method
of identifying a series of colours is folly.
The covering over of an early paint by later redecoration
often had the effect of altering the original colour. Unless
this is understood and allowed for, great distortions are
likely, with blues being understood to be greens, and white
as putty colour, for example.
It is virtually impossible to correlate the schemes applied
to the different elements of a room, or series of rooms, when
one carries out a paint scrape. Nor can any intelligent statement
be made about the date of a particular layer.
An article expanding on this can be seen here: The "Paint
Scrape".
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