Octopus Barock Highlighter Ink transforms your fountain pen into a precision marking tool. This sustainable alternative delivers vibrant neon yellow with exceptional color saturation and luminosity, perfect for highlighting fine print in documents, bibles, and study materials. Formulated to be lightfast, waterproof, and eraser-proof, it works seamlessly with piston-fill pens, converters, and calligraphy nibs. Refill dried-out highlighters or use with pump markers for an elegant, eco-conscious approach to marking. From Dresden-based Octopus Fluids, this ink combines functionality with style—marking important text beautifully while reducing plastic waste.