AGM's Blue indicating silica gel is comprised of Cobalt Chloride and changes from blue to pink to indicate that the desiccant needs replacing.
AES Industries - Blue Indicating Silica Gel Desiccant Beads, 1 Quart - AES Industries
Moisture Indicating Silica Gel Desiccant Bags
Tank Vent Dryer - Desiccant Breathers - AGM Container Controls
BL/D10787 In-Line Desiccators - AGM Container Controls
.com: Interteck Packaging 1 LB Premium Quality Blue Indicating Silica Gel Bulk Desiccant Beads, Industry Standard 1-3mm - Rechargeable (Blue to Pink) : Industrial & Scientific
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Bulk Indicating Silica Gel Granules, 55-lbs Bulk Indicating Silica Gel Desiccant
R Series Transformer Breathers - AGM Container Controls
Silica Gel Mix - 90% White 10% Blue - AGM Container Controls
Desi View Bags - Silica Gel Desiccant - AGM Container Controls
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Bulk Silica Gel Desiccant AGM Container Controls, Inc.