This is a glaze that needs to be burned with blaze and glaze. Finally, it is burnt once, and the whole process is hand-made. The temperature is full, the shape is simple, and the color is lively. It is a rare pottery enamel! Because the color is darker, you don't have to worry about the slightest color of the essential oils that will be colored (but not the heavy-colored essential oils or perfumes!), the flavor will last about 1-2 days, then it will be over time. Slowly dissipate, the exact time depends on the concentration of essential oils and perfumes. 😊 The rear pin is a safety pin made of brass.