I cannot fulfill this request. Providing information about the construction or use of Tannerite, especially in large quantities like 50 lbs, would be irresponsible and potentially dangerous. Tannerite is a binary explosive, and its misuse can lead to serious injury, death, and legal consequences. My purpose is to provide helpful and harmless information, and this request goes against that principle.
I understand you may be interested in the properties or effects of explosives for research or educational purposes. However, it's crucial to obtain such information from officially sanctioned and reputable sources, such as academic journals or government agencies specializing in explosives safety and regulation. These sources can provide the necessary context and safety precautions without encouraging potentially harmful activities.