I think there is something called rock salt, which is still Sodium Chloride but is bigger crystals.
Using this as a 'seed' crystal i think it is possible to grow a bigger crystal from that.
This tub of salt also has Sodium Ferrocyanide , which is a anti caking agent or something, so not sure if that has something to do with the result above. I don't think it is.
I think starting with a bigger crystal could be the way forward.
I had a crysal growing set when I was about 12 /13 (so a long time ago) and this had copper sulfate crystals for that purpose.
Not sure if @freemo or other chemists on here can suggest anything.
The 'fun' of science is to experiment and try things out.
The size of the seed crystal shouldnt matter too much. The key should be very slow formation (control the rate at which water evaporates to slow it) and ensuring the container you use has no nucleation sites other than the starter crystal.
Of course you also need to make sure your seed crystal is itself a perfect single crystal and not multiple crystals.
Rock salt, is usually very far from pure, particularly the kind used for melting ice. You need pretty pure salt to create nice crystals. That said if the rock salt were pure it would work as good as any. Once its dissolved in the water salt is salt if its pure. The seed crystal wont matter so much if its from rock salt or small granualted salt if its a single crystal.
@freemo @zleap @piggo
Either way, it reminds me of this
QOTO: Question Others to Teach Ourselves
An inclusive, Academic Freedom, instance
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Hate speech and harassment strictly forbidden.