Beautiful Rainbows Works Sun Catcher Stained Glass Water Prism Handmade Size (approx.): Height 75mm, Width 40mm This item has been used a few times and stored at home. Please refer to the images for condition. Please understand that this is a used item before purchasing. How to use: Please use distilled water or purified water. Tap water contains impurities that can react with the metal and cause the glass to cloud. Cleaning: For cleaning the inside of water stains, use baking soda and a test tube brush or a kettle brush (with a wire handle). The prism effect will not be produced by sunlight through frosted glass or fluorescent lights. Spotlights and clear light bulbs will slightly decompose the light and emit rainbows.