Wearingeul Potion Fountain Pen Ink Additive Full Bottle (10mL)How to use: Shake the Glitter Potion bottle well before use. Add it to your ink in the recommended ratio: 1 part Glitter Potion to 10 parts ink. Mix gently to distribute the glitter evenly. Usage tips Always shake the shimmering ink well before each use to keep the glitter suspended. Use fountain pens with a generous flow or a converter, and clean them regularly to avoid clogs. Avoid leaving shimmering ink in the pen for extended periods of inactivity.