These can be used to display grains of rice, small gemstone chips, gold flakes, spices, volcanic ash, etc.
When writing on rice, jasmine rice is recommended. Use a fine-tip, waterproof and fade-proof pen from an art store, or the fine arts department of a craft store. 0.005 is a good line width. Baby oil is commonly used as the liquid for rice vials. It is often dyed with food coloring.
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Approximately 25x10x10mm octagon-shaped glass perfume bottle charms. Screw-on cap style varies. Can hold perfumes, oils, or other liquids. Reservoir is the perfect size to display a single grain of rice. Measurements include cap.