Our company proposes 100 ML Diamine Registrars Blue and Black Ink, which has been utilized for many years by a lot of UK registrars for official permanent records. It is a completely waterproof and traditional iron-gall formulation. Also, it is perfect for utilize in all brands of fountain pen. The ink will last hundreds of years on the page as it is quality tested, non-toxic material with certified formula. It initially writes blue and then darkens. Further, 100 ML Diamine Registrars Blue and Black Ink comes in plastic bottle packaging at pocket-friendly prices.