â  Prices are based on round trip travel with returns between 1-21 days after departure. These are the best fares found by travelers who searched TripAdvisor and a select group of our fare search partners in the past 72 hours. Ticket prices and seat availability change rapidly and cannot be guaranteed.
Description. Cobalt(II) chloride (CoCl 2) is the most common cobalt compound found in laboratories. The dramatic color change of blue-purple Cobalt(II) chloride to a rose color when hydrated makes CoCl 2 an excellent indicator for water in dessicants.
Cobalt has been known and used by people for its beautiful colouring and pigment properties as far back as 2500BC. Egyptian cobalt blue paints and Prussian cobalt oxide necklaces have been dated back to this time while cobalt glass has been found in a Greek vase dated at 100 BC.