The impression gives a reproduction of tissue. a reproduction is obtained by pouring dental stone or other suitable material into the impression and allowing it to harden.

Osmosis is defined as the movement of solvent (like water) from a region where the concentration of solute(like salt) is lower to a region where the concentration of solute is higher through a semipermeable membrane.

Salt water is a hypertonic solution as the concentration of salt ( solute) is higher. Therefore, in this case water from vegetable will move outside causing the cells to become fragile.