This unusual ink is the result of a long quest for a replica color to 1970s era mercurochrome antiseptic, which was famous for its distinctively bright orange/pink/red fire like tones. An artist testing the ink discovered that when used with a brush, the heavier applications of the ink would dry to develop into sepia shaded highlights within the brush strokes of the fire like color shades. No other carmine ink has been found to have this feature ...and any unique ink deserves to be among our palette of inks based upon the hope somebody might gain pleasure through its use. Noodler's Summer Tanager Bottled Ink is all U.S. made and boasts Archival, Anti-Forgery and Anti- Feathering features. The ink is specifically designed for fountain pen use.