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Self-indicating silica gels will adsorb moisture in exactly the same way as standard non-indicating (white) silica gel, but they will literally indicate when they are becoming saturated by changing their colour.
Secondly, if regenerating the silica gel, the self-indicating grade will be ready for reuse, when its original colour has returned.
Silica gels uses a small concentration (between 0.5 and 1.0% weight for weight) of moisture sensitive cobalt chloride indicator, which gives a blue silica gel. This changes to pink as it adsorbs moisture and becomes saturated, returning to blue as it is regenerated.
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