From the manufacturer:
Exquisite metallic gold ink that will not tarnish or lose its luster. Dries quickly on porous papers. Metallic results are most stunning without embossing. Quick and easy alternative to gold leafing without the clean up! This package contains one 4x2-1/2 inch ink pad. Acid free, water based, archival. Conforms to ASTM D4236. Imported.