24% Lugol's Iodine Solution in a 5-ml coloured glass dropper vial. Shipped with a cap, comes with a dropper. Contains 24% Iodine crystals (99.8%+) and 48% Potassium Iodide (USP Grade) in pure distilled water. Works great for water disinfectant, antiseptic for cuts, a biological stain, detoxification, saltwater aquariums, animal care, and supplementation. I want to offer this unique product for those that like the strong stuff. Will stain skin for up to 4-days (personal experience). 24% solution is specially formulated for water disinfection purposes for hikers and backpackers to cut pack-weight. Only one drop per liter of water is needed to purify natural waters that can be seen through if left standing for 30 minutes.