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The silica gel is contained in a clear plastic bag. It has many microscopic holes to let the moisture slowly through. The silica gel then will indicate that moisture is present. The yellow beads will change to an green colour PLEASE NOTE . These are silica gel and not dessicant clay. Silica gel is a desiccant - it adsorbs and holds water vapour Self-Indicating YELLOW - The gels come packed in air tight bags for a long shelf life Printed on each sachet :- DESSICANT SILICA Do not eat