Whiskey - Somewhere between coffee liqueur and strong whiskey shades. Robert Oster Signature® Fountain Pen Inks are non-toxic and eco-friendly. The bottle is made from recycled chemical waste that would otherwise remain a hazard to the environment. PET is the most recycled plastic in the world and much more often recycled than glass bottles. Note: Some colors may appear differently on different papers. Shading may vary from pen nib to pen nib.