Reusable Indicating Desiccant Indicating Drierite® desiccant is blue when dry and changes to pink upon absorption of moisture. The color change is pronounced and clearly visible. This makes Indicating Drierite® desiccant invaluable when it is necessary to know with certainty that dryness is being maintained and to signal when the drying agent should be regenerated. Regeneration is accomplished by simply heating the desiccant in an oven for 1 hour at 210°C.Mesh size of 8 is recommended for general lab use and is what we have listed. Others are available upon request.