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Comment by mrob

2 days ago

Also much harder to control. Oven drying has the advantage that you can set the temperature so there's no risk of overheating anything.

8 comments

mrob

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geor9e  2 days ago

I do microwave. It's pretty easy to not burn, just undershoot it - 10 seconds, see how hot it is, another 10 seconds. Once it's blazing hot shake it back and forth to get the steam off. If it's the colored kind (white when good, pink/blue when full of water) it's easy to tell when it's good. Takes about 30 seconds all together - I recharge my dessicant packs before every use. Of course, people are welcome to spend hours doing the oven method if they want. I just don't personally see an advantage, unless you have an industrial amount of packs to recharge.

  • lazide  2 days ago

    FYI, but some desiccant coloring agents are cancerous

    • hilbert42  2 days ago

      It's cobalt chloride—the same stuff that used to be used on those little weather indicators where a little man or woman would pop out to indicate whether it was going to be wet or dry. They usually had a spot of blotting paper about 2cm round soaked in it. Cobalt chloride is blue when dry and pink when damp.

      All ionic cobalt salts are toxic so cobalt chloride is not used as an indicator in silica gell packaged for use with food. That said, it's an excellent indicator for telling whether your silica gell is still working or not.

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lugvruzzle  2 days ago

is there any harm in overheating silica when drying it out?

  • pumnikol  1 day ago

    Pure silica? It's really just SiO2. It might kind of fragment/ burst if it has a lot of water absorbed and you heat it too fast. Then everything in the vicinity would get sprinkled with fine dust which you shouldn't inhale in large quantities, as it might cause silicosis.