34 Pa. Code § 43.88 – Conveyance of explosives.

(a) No greater quantity of explosives than that which is required for immediate use shall be taken into the working chamber.
(b) Explosives shall be conveyed in a suitable covered wooden box painted red.
(c) Detonators shall be conveyed in a separate covered wooden box painted red with a one inch yellow stripe running horizontally entirely around the box.
(d) Explosives and detonators shall be taken separately into the caisson.
(e) After blasting is completed, all explosives and detonators shall be returned at once to the magazine, observing the same rules as when conveyed to the work.