article_snippet: Scroll down for video .
article_snippet: With old pictures, blobs or spots can appear due to the way the film is developed or mishandled in the processing stage.
article_snippet: Could it be to misinterpretation?
article_snippet: If a film camera is used, has the negative been tampered with?
article_snippet: Microfilms of these cases, collectively known as Project Blue Book, have become available for anyone to view online.