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engineer's blue
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English
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English
Wikipedia
has an article on:
engineer's blue
Wikipedia
Noun
edit
engineer
's
blue
(
uncountable
)
A blue
paste
made from
Prussian blue
and some
oily
substance, used to verify the
mating
of
components
by rubbing a coated
workpiece
against the target
surface
to leave marks.
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English uncountable nouns
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