When any explosive has deteriorated to any extent or shows obvious signs of deterioration, such as hardness, discoloration, excessive softness or hardness, or the package shows signs of moisture, the person in possession of such explosive shall immediately report the fact to the “Chief” having jurisdiction and upon his authorization shall proceed to destroy such explosive in accordance with the instructions of the “Chief” having jurisdiction, or the manufacturer of the explosive. Only competent experienced persons, at least 21 years of age, shall do the work of destroying explosives.