The holder of a licence authorising the person to manufacture explosives must ensure that any explosive mixture that cannot be used or loaded into blast holes on the day it is manufactured is—
(a) put in closed, clean, non-metallic, leak-proof containers, conspicuously marked "EXPLOSIVE MIXTURE"; and
(b) stored in accordance with the requirements of Part 5 until the mixture can be used; and
(c) used as soon as reasonably practicable.