see whether they are pink, as opposed to blue.
google can provide many helpful discussions.
CoCl3.6H20 forms pink crystals. When they are heated water is evolved and they turn blue. Explain how you could use cobalt chloride as a test for water??
2 answers
I found this on Google although it is about CoCl2.
https://chlorine.americanchemistry.com/Science-Center/Chlorine-Compound-of-the-Month-Library/Cobalt-Chloride-Colorful-Moisture-Detector/
https://chlorine.americanchemistry.com/Science-Center/Chlorine-Compound-of-the-Month-Library/Cobalt-Chloride-Colorful-Moisture-Detector/