Whether it's a color race, festival, gender reveal, youth camp, photoshoot, school event, fundraiser, or color war, Chameleon Color's bulk blue color powder will make it vibrant and fun! 25 pounds is enough colored chalk powder for 15 to 20 people; if you are planning a large-scale event, we recommend 60 pounds of color per 100 people attending. Encourage everyone to dress in white for the vivid color to have maximum effect. The blue color powder is easy to clean! So shake, wiggle, and blow off loose color from hair, skin, and clothes while it’s dry. Then, for the straggling blue color powder on your skin and hair, use a little shampoo and soap and you’re good to go. For leftover powder on clothes, just toss into the wash. We recommend using the color powder outdoors; you can sweep away any remaining color or wait and the next good rainstorm will wash it all away. Don't worry, the color powder is environmentally safe. We take pride in our product using only the best and safest ingredients, so all of our ingredients are FD&C and D&C approved. Made in the U.S.A.