after it’s been hit with UV light — sunlight or even indoor light — it slowly starts to change

The barrel is polypropylene with an airtight cap that helps stop the ink from drying out in storage

This isn't just a basic squeeze marker - the rear tank cap unscrews so you can refill and reuse it instead of tossing it when empty

Chrome Yellow

uni pin fine line brush pen Colors:Light Grey after it’s been hit withThe Uni Pin brush pen uses a flexible synthetic fiber tip rather than a fixed width fineliner nib, so the line varies with pressure push down for a broader fill or medium width script, lift up for a fine detail line, all from one pen. That range makes it suited to expressive hand lettering and brush style titles rather than the consistent monoline a technical fineliner produces. The ink is uni ball's archival "Super Ink," a water based pigment formula