Yes correct. My apologies, I forgot to mention. Yes, NEVER use the same heating source as the one for food. I use my friend's workshop's industrial oven. Additionally, I use vinyl gloves when handling them. I screwed my mum's flying pan heating them before and got into serious trouble because it was a new frying pan that cost a couple of hundred.
The website that you have quoted is unreliable. Generally, Cobalt chloride (CoCl2) is safe if not inhaled. According to the website, it says "Cobalt Chloride has been classified by IARC (International Agency for Research on Cancer) in Group 2B. Which states Cobalt Chloride is possibly carcinogenic to humans."
Note that the claim is FAR overstated, looking from a scientific perspective (probably trying to promote the alternative products). Ramafi GJ, et al (2004), and several other journal publications have shown that while cobalt compounds, especially its hydrated dichloride have been known to cause cancer in animal tests, human results are inconclusive. From what I know, it has only been classified as such because of the cell physiological relationships and the link to humans is highly postuated (but unproven). Inhalation has been advised against. Then again, who is going to inhale sillica gel purposefully? LOL! In order to obtain the carcinogenic effect, you probably need to inhale over 1800g of sillica gel given that the CoCl2 content in the gel is relatively low - CoCl2 is added only to INDICATE the presence of water (as seen from via colour change from hydrated to anydrous form) not as a key ingredient.
In Singapore, if i'm not mistaken, the CoCl2 concentration must be below 130 ppm or so (cant quite recall the figure), EVEN in the sillica gel. This is so that even if babies ingest them, they are still relatively safe.
But yes, prolonged exposure may not be such a great idea (hence dry cabinets
). Hmm... Maybe I should buy more sillica gel than reheating them XP.