Noodler's Firefly High-Visibility Ink Refill - ND-19170 for Fountain Pens | Perfect for Night Writing & Signature Highlighting

It's nice and bright, works great. But it is a wet ink and does bleed through thin Bible pages unless you develop a careful highlighting technique.I use this in a platinum preppy highlighter and love it. It's my main highlighter for everything now. I just have to be careful when highlighting in Bibles.Highlighters use a lot more ink than fountain pens, so be prepared to use it up fairly quickly if you highlight a lot regularly. I find my self refilling it more often than expected, but I don't mind it. It's great and cheaper than buying Sharpies and wasting more plastic every week.