Event 3-C. Melt Ice…Below Its Freezing Point. Fill a beaker about one-third full of crushed ice. Carefully pour 4 to 8 tablespoonful of salt onto the crushed ice. Then add another one-third full of crushed ice on top. Prepare the ice-salt mixture ahead of time so that Pupils are not aware that salt was used. If done carefully, the salt will not be visible to the observer. (See Fig.3-2.)