I was thinking of making an MWIR lens from table salt, which is quite transparent for it. That needs a big, monolithic cylinder of salt - 3x1 cm. Now, growing it the classic-oversaturated-solution way would take forever, if feasible at all. And i want to try to just melt some salt and cast the piece that way. So, primary question - what kind of safety concerns are there about heating up and melting table salt? Would it just melt, or start decomposing/reacting somehow? And a secondary question - is there a point? That is, would it solidify into something monolithic without using Kyropoulos method or similar? Bonus question - given the goal above and a set of household materials, how would you proceed to achieve it?