engineer's blue
nounDefinitions
A blue paste made from Prussian blue and some oily substance, used to verify the mating…
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.
The neighborhood
Vish — recursive loop
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sense glosses and etymology drawn from English Wiktionary · source · CC-BY-SA