Wisesorb 2 LBS blue to pink Indicating Silica Gel Beads are beads of silica gel (desiccant beads) , used for absorbing moisture from the air to protect things that would be adversely affected by dampness. The beads can be reactivate by placing into oven to drive off excess moisture. Dry beads show blue and turn a faintly pinkish clear color after reaching moisture capacity. The blue color indicator is convenient to judge when they need to be changed. Wisesorb 2 LBS blue to pink Indicating Silica Gel Beads are perfect to anyone working in a humid environment and/or with products that are sensitive to high humidity. It is difficult to work with 3D printing if you live in a very humid environment. Give the 2 LBS reusable Indicating silica gel a try and you will be find this product is amazing. Placing your filaments in a sealed container with a few ounces of the beads has kept the filaments and prototypes dry and strong. Use them in smaller enclosed containers like safes, storage cases, gun case's or guitar case's. Dumped the dry spheres into a muslin bag and hung it on the door of your safe. Works great, no more stale moldy smell when you go retrieve items. Use these to make your own desiccants for storing ammo. Pour some beads into small containers, and put them in with your ammo to absorb any excess moisture. Reusable and save money. Put silica gel beads in little mesh bags to make your own rechargeable dehumidifier & dryers for your tool chests, safes, electronics, drawers and cabinets by using small linen draw-string bags or organza bags with indicating silica gel beads. Wisesorb desicant crystals work nicely. Place them in organza draw string bags, and place them in drawers, and hang them in closets, and putting them in sweater boxes. when the beads turn dark and green, they have absorbed moisture. In order to re-use the beads, you can dump the crystals on a cookie sheet and bake them in the oven until they dry back out and turn orange again.