A convenient way to let your students interact with luminous chemicals! Each 1.5 inch light stick can glow for up to 6 hours. Each box of 50 lightsticks comes in an assortment of colors: red, orange, yellow, green, blue, purple, and pink. Great for fundraisers or your school store!Try This: Use the light sticks to demonstrate rate of reaction by placing one glowing stick in hot water, and one stick in cold water. Which stick glows brighter? Which stick will last longer?