a kind of side thought, i used sea salt and got good crystals. The subject of anti caking agents came up earlier in the thread, so wondering if this
actually did much to the crystal I did a little digging.
I found this
http://pubs.acs.org/doi/10.1021/cg201661y
Having read it, I think you are likely to have alot better luck with sea water, if you cant get that, then pet shops sell salt as a aquarium tonic,
this contains nothing but sodium chloride, and is different to marine aquarium salt.
Its pretty cheap so might be worth a go
The more i search, the more it looks like it is down to the anti cake stuff
http://pubs.acs.org/doi/10.1021/acs.cgd.7b00023
[Edited on 12-10-2017 by NEMO-Chemistry]
Sorry but found another good resource for crystal growing for you.
http://www.uq.edu.au/_School_Science_Lessons/topic09.html
And while not the best looking crystals, i thought of citric acid as another cheap one you can do. I havnt done this one myself, but I do have citric
acid so have a solution cooling as we speak!!
[Edited on 12-10-2017 by NEMO-Chemistry]
Also not sure what country your in, but i checked and Alum is indeed used widely as pickling spice, apparently its very common in shops with a spice
section. So maybe check your local supermarket.
You might get lucky and get it fairly cheap, find some brand names for your country and look on Amazon for pickling spice. Where abouts are you
anyway?
[Edited on 12-10-2017 by NEMO-Chemistry]
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