When new stock arrives it should be stored with the rest of the stock. The new stock should be stored behind the old stock, so that the older stock will be used first (this is called rotating salon stock).

If the newly ordered stock was stored in front of the remaining old stock, then the old stock could remain unused for some time leading to deterioration and become unusable. A good rule to go by is F.I.F.O. (first in first out) and L.I.L.O. (last in last out)