Supplied in stoppered vials containing 100 strips per vial. Paper indicates relative humidity by color change: pink indicates high humidity; blue indicates low humidity.
Instructions: Coblat chloride test paper is a humiditiy-indicating paper. To be most effective, the color of the cobalt chloride test paper should be dark blue.
Should your coblat chloride test paper ever turn light blue or pink in color, this means that humidity has affected the paper. This can be corrected by placing the paper in a drying oven at no more than 100 °F for two (2) hours. You may place the plastic vial and test paper in the oven to dry, just remember to remove the vial’s plastic cap.