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Contact SupplierNoble Silica Gel Self Indicating (Blue) is normally used as an Indicator in Transformer Breathers and moisture adsorption in sealed containers / vessels. Originally it comes in dark blue color (without moisture) & while absorbing moisture it turns in to pink color shows an indication that it has to be replaced or time for regeneration. Physical appearance of Silica Gel remains unchanged without any side effects or chemical reaction even after adsorption.