smoke-shade
Noun
Meaning
smoke-shade (plural smoke-shades)
(archaic) A tint measured from 0 to 10 on a scale for comparing different varieties of coal according to the amount of unburnt carbon in their smoke.
Noun
smoke-shade (plural smoke-shades)
(archaic) A tint measured from 0 to 10 on a scale for comparing different varieties of coal according to the amount of unburnt carbon in their smoke.