It is also called Humidity Indicating Silica Gel.  In this type all the silica gel particles are impregnated with an indicator. It gradually turns pink from blue when absorbing moisture and gives a ready indication that done its work and need replacement or regeneration. It is used as indicator and dryer, and can be used with White Silica gel.

Technical Data Specification

Name:  SILICA GEL BLUE

Item		Specification
Size		1-3MM\2-5MM
Appearance		Blue or Light-Blue
Ratio of Size Qualified % ≥		99
Adsorption Capacity , %	RH=20% ≥	8.0
	RH=35% ≥	13.0
	RH=50% ≥	20.0
Loss on Heating , %           ≤		5.0
Rattler Loss , %                 ≤		10.0
Bulk Densit , g/l             ≥		750
PH Value		4-8
Specific Resistance , Ω.cm         ≥		1000
Qualified Ratio of Spherical Granules,%      ≥		89%
Color	RH=20%	Blue or Light-Blue
	RH=35%	Purple or Amaranthine
	RH=50%	Light Red or Pink

Types of Dessicant

White Silica Gel	Blue Silica Gel
Orange Indicating Silica Gel	Desiccant Clay