Nothing happens until you get down

Nothing happens until you get down to the eutectic temperature. At that point, you will start to get both ice crystals and salt crystals forming.If you keep cooling it, you will obviously end up with a solid mixture of ice and salt. You are moving straight from the "salt solution" area of the phase diagram into the "solid salt + ice" area.

Nothing happens until you get down to the eutectic temperature. At that point, you will start to get both ice crystals and salt crystals forming.

If you keep cooling it, you will obviously end up with a solid mixture of ice and salt. You are moving straight from the "salt solution" area of the phase diagram into the "solid salt ice" area.