engineer's blue
A blue paste made from Prussian blue and some oily substance, used to verify the…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.
Meaning
1 senses(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.
Lessons for this word
1 lessons- A1Countable and uncountable nouns — Because it can be uncountable