Stannous pyrophosphate is a solid, fine crystalline product that is soluble in most acids. It has applications in the dental industry, especially inhibition of tooth plaque. It takes part in the stannous-pyrophosphate and technetium-stannouspyrophosphate complexes formation. This is diagnostic imaging agent for in-vivo labelling of red blood cells (RBCs) with 99mTc and areas of altered osteogenesis. It is a skeletal imaging agent used to demonstrate areas of altered osteogenesis, and a cardiac imaging agent used as an adjunct in the diagnosis of acute myocardial infarction.