The Ice Cream Smooth™, opaque ink is perfect for writing in journals, decorating cards, pattern drawing, or detailed accents. Bold 10 nib is ideal for coloring and creating paint-like effects. All colors are bright on white paper and produce outstanding effects on quality black paper. Non-fluorescent pen ink is waterproof and fade resistant when dry; fluorescent ink glows under blacklight. Note: Moonlight ink comes in two types: archival and fluorescent. Archival Gelly Roll Moonlight colors contain pigment-based ink – chemically stable, waterproof, and fade resistant. Fluorescent Gelly Roll Moonlight colors can fade if exposed to direct sunlight and glow under a black light.