Humidity Control: DIY Salt Packs

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Psyck
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Location: Bangalore, India

Mon Jan 15, 2018 3:29 am

VoirenTea wrote:
Sat Jan 13, 2018 11:46 am
I am interested in the answer! I could buy Tyvek in A4 sheets, or rolls of fabric (or, amusingly, whole-body coveralls) for a lot less than a minimum order of envelopes which seem to be much less common here, but if I can use fabric I already have...

It looks like Tyvek is breathable, but less so than uncoated nylon or most raincoats.
I think any thin breathable fabric should work as a substitute to Tyvek for this purpose. It should be trivial to experiment and confirm this. Over time, it is likely that salt crystals will deposit on the material used - which would require periodic cleaning.
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pedant
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Mon Feb 26, 2018 3:48 pm

yes, any breathable fabric will work for preventing stuff from falling into your salt pack.
however, normal fabric will provide much less splash resistance if the jar gets bumped.
tyvek is fairly waterproof. if you accidentally knock the jar over, i don't think much if any liquid will leak out -- especially if you notice and pick it up right away.
Mchrlund1 wrote:
Fri Jan 05, 2018 9:40 am
So I finally got around to setting up the experiment. As the mason jars I got were a bit bigger, I thought why not just up the amount of mixture. 200g water heated and mixed with 34g sugar until dissolved, then added 140g of unrefined sea salt and mixed for a bit.
looking again at your picture, i'm noticing your jar has a layer of scum. i'm thinking that's from using unrefined sea salt.
did it go away?
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pedant
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Mon Feb 26, 2018 11:20 pm

i actually just made a new one today scaled up 4x (400mL water)

i would like to make a cutout in the tupperware lid and glue in a piece of tyvek with silicone sealant, but i don't have any right now.
so for now there is no lid. just some rubberbands to prevent a cake from falling in or something. the paper towel probably doesn't do much, but it might block some smaller debris. obviously, i have to be careful not to bump it, but it should be fine. the tupperware has tall sides, and the rubberbands give it a non-slip base.

Image

edit: don't use rubberbands. they're a little smelly
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pedant
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Wed Feb 28, 2018 3:43 pm

originally brought up by Microshrimp, some brands of salt have an odor. i believe that this smell is adsorbed onto the crystals and comes from packaging, transportation, or storage. it's most apparent while the salt solution is still hot, but you can still smell it after it cools down.

to me, it smells somehow salty (reminiscent of gargling with saline). Atlas described the smell as powdery.

i looked at a couple of brands of salt i have on hand right now: Morton salt (non-iodized) and Morton natural sea salt (non-iodized).

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for each one, i mixed 20g salt + 30g 65°C (150°F) water in a small drinking glass.

here are notes on how they smelled over time:

Morton salt (non-iodized):
  • day 1, just after mixing (still hot): quite smelly (relative intensity: 10)
  • day 1, after cooling: less smelly (RI: 8)
  • day 2: some improvement (RI: 5)
  • day 3: significantly dissipated (RI: 1-2)
  • day 3, after adding 15g water, heating in the microwave, and stirring: odor has returned slightly (RI: 2-3)
Morton natural sea salt (non-iodized):
  • day 1, just after mixing (still hot): smelly (relative intensity: 7)
  • day 1, after cooling: some improvement (RI: 5)
  • day 2: maybe a bit better (RI: 4)
  • day 3: smell significantly dissipated, seems fine to use (RI: 0)
  • day 3, after adding 15g water, heating in the microwave, and stirring: about the same (RI: 0-1)
i think it's important to smell your salt pack before putting it in the pumidor.
if it's smelly, it will probably be fine to use after airing it out for 3-7 days (give it a daily stir).
if that doesn't work, try another brand.
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