Product Description Poseidon’s Reef is a stunning deep teal ink adorned with a captivating purple sheen , evoking the mystical beauty of the ocean’s depths. “The alchemist’s concoction from his visit to the enchanting coral reef of Poseidon himself. Our ink is formulated to be gentle on nibs, preserving the delicate components of your fountain pen and extending its lifespan. Suitable for Fountain Pens, & Dip Pens. Periodically flush your fountain pen with clean water to remove residual ink.”