Bible Dictionaries
Turnbull's Blue
Webster's Dictionary
The double cyanide of ferrous and ferric iron, a dark blue amorphous substance having a coppery luster, used in dyeing, calico printing, etc. Cf. Prussian blue, under Prussian.
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Bibliography Information
Webster, Noah. Entry for 'Turnbull's Blue'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/t/turnbulls-blue.html. 1828.