According to a study carried out by researchers from the Department of Surgery, Meridia Huron and Hillcrest Hospitals, Cleveland, Ohio, razor blades can be dissolved by the acid in your stomach if you (hopefully accidentally) ingest one.
They placed several razor blades and other metal objects in gastric juice and found that after 24 hours, the razor blade size had reduced by 63%!
This was an important development in terms of what actions physicians can take when facing a patient who has ingested similar objects.