These are silica gel granules (desiccant granules) used to absorb moisture from the air and protect items that can be affected by moisture. Pearls can be "charged" by placing them in a warm oven to ward off excess moisture. Dry bulbs are dark blue; Balls that have reached their moisture capacity will turn a slightly pink translucent color making it easy to see when they need to be replaced. I have several small bench style power tools that I keep on my workbench in relatively humid climates. When not in use, I store each tool in a separate, durable plastic bag. In each bag I put a small jute bag filled with these silica gel balls. They seem to be working great; after several months of use, the instruments are still dry and do not show any surface rust. I keep a couple of pouches handy for each tool so I can switch out the new pouch while the old one charges up. In general, a good, simple and effective solution to an unpleasant problem.
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