What items are mandatory for all MOP 50 submethods?

The inclusion of a desiccant and a Method 50 label is crucial for all MOP 50 submethods. A desiccant serves the essential purpose of absorbing moisture that could potentially jeopardize the integrity of the items being preserved. Moisture is a major threat that can lead to corrosion, mold, or other forms of degradation. Therefore, having a desiccant included in the preservation process helps ensure that the items remain dry and protected.

Additionally, the Method 50 label plays a vital role in identifying the method of preservation used. It provides necessary information and instructions regarding the handling and storage of the items, ensuring all personnel involved are aware of the specific preservation technique applied. This label assists in tracking and maintaining the items throughout their lifecycle, thereby enhancing accountability and safety in the storage process.

Other options may include materials that are beneficial under specific circumstances, but they lack the overarching requirement of being necessary for all MOP 50 submethods.