Iodine fumes adhere to the oils deposited in a latent fingerprint. Iodine Crystals are ready to use in glass ampules. The Iodine Fuming Applicators are a blow-through design which provide concentrated and directed fuming. The Iodine Fuming Kit contains a glass fuming apparatus, drying crystals, glass wool, and iodine crystals in a field case. The Iodine Print Enhancement Applicators are designed for use after iodine fuming to enhance detail. Store in a cool dark place. Use with caution.