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Light Fastness Standards 1 to 8
These
are a series of 8 wool fabrics dyed
with specified blue dyes to give
blue wool cloth ranging from very
low light fastness to very high
light fastness .they from a numerical
scale of 1 to 8 where 1 has the
poorest light fastness to 8, which
has the nest light fastness .This
allows fabrics to grade, using a
grey scale for change in color,
for correlation with performance
in use . they are used in ISO 105
B series of tests.
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