A few weeks ago I put some pure Sodium Chloride in a beaker with de-ionised water to dissolve, then pured in to a small glass bowl and lkeft it to evaporate.
All the water has now gone, so I examined the resulting crystals under my USB Microscope.
Some table salt also contains Sodium Ferrocyanide (anti caking agent). So I ordered some pure Sodium Chloride from a supplier (Better equipped) who I have bought lots of stuff from, beakers, flasks, etc.
@freemo @zleap *le sigh*