In cryoextraction, this is done to grapes to produce the most concentrated juice in pressing
The sugars and other 
dissolved solids do not freeze, but the water does, allowing a more concentrated 
grape must to be pressed from the frozen grapes, ... Ice wine production is risky (
the frost may not come at all before the grapes... [DOC] [TLE] Cryoextraction explained by Ribereau-Gayon - Jacqueline Friedrich [PAR] Pascal Ribe reau-Gayon Denis Dubourdieu Bernard Done`che Aline ... Raoults's 
law states that the freezing point of a solution lowers as the solute concentration 
increases.