About J Herbin 1798 Ink - Kyanite du Népal Since the discovery of the famous mining region of Nepal, Kali Gandaki, Kyanite has been recognised as a noble mineral because of its similarities to the rich tones of sapphire. Kyanite du Népal 1798 ink is a bright blue/turquoise in colour and is magnified thanks to a cloud of silver glitter for powerful and elegant writing! Presented in an elegant 50ml glass bottle with seal and wide-neck opening perfect for filling fountain pens from. Silver flake, being a solid residue, will sink to the bottle of the bottle if unused - simply shake well to rejuvenate. Due to the sedimentary nature of this product we do not recommend you leave in your fountain pen for prolonged periods of non-use and do not recommend for use in vintage fountain pens with fine feed systems.