Tips : if the crystal is broken in pieces, you can still use them. Put them into a spray mist bottle and mix it with water and it will work just like the liquid spray one, as for ratio you just have to adjust yourself.. the crystal will dissolves into the water overnight. I buy the little spray mist bottle at Mr Diy for around RM2++ so I can bring it along and reapply it after a hot day sweating.

Just wet your armpit a bit and apply the stone like you apply deodorant stick.