When the two mix together it is called a saturated solution.
That means you made a saturated solution (depending on circumstances, even a super-saturated one).
You now have a saturated solution at room temperature.
When it dissolves in an almost saturated solution, however, the process is endothermic.
Thus, a saturated solution creates a buffer with standard pH.
For example how much ammonium sulfate it would take to form a saturated solution in water?
The process of forming a saturated solution in this case is endothermic.
Would soaking them in a saturated solution be sufficient?
At 15.5 Celsius, a saturated solution of brine can hold 26.4 % salt by weight.
If you do not use a saturated solution, then your crystals will not grow quickly.