email inkn. ink for the decoration of surfaces of glass, porcelain, metal, etc.
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1882 New Remedies Nov. 347/2 Diamond ink for glassware... A description of email ink.
a1884 E. H. KnightPract. Dict. Mech. Suppl. 311/1Email ink... Colored inks—black, white, red, blue—used with a quill on glass, porcelain, ivory, marble, bone, mother of pearl, or metal.