Forgery, fraud and blackmail letters, they will all undergo document examination. This kind of examination will use forensic comparison microscopy to test the materials of the documents. By using forensic comparison microscopy the forensic expert will know the type of paper used and if the paper bears some watermark, torn paper can also be matched up using forensic comparison microscopy.
The importance of document examination is to find the culprit for the cases mentioned earlier. Handwriting experts also can determine if the signature has been forged. For typewritten evidence, the forensic experts can identify if the ribbon used was plastic or cloth by using forensic comparison microscopy.
The most common evidence submitted in this department is the handwritten and typewritten documents. Other examinations using forensic comparison microscopy is checking banknotes, seal, machine validations and other documents used in forgery cases.
It is advised that all the documents submitted in this department must be original than photocopied, photocopied documents do not bear ink marks and other indications that are viewed under forensic comparison microscopy.

There are some things to observe when collecting and preserving documents evidence, first thing to do is to protect the document from being folded then keep it in a large envelope that will fit the size of the document. Then, submit the documents to the laboratory to undergo forensic comparison microscopy examination. After the documents have been tested, it should be stored in a dry place away from high temperature and strong light.
Some things to avoid when handling documents do not fold or put the documents inside your wallet, bags or insert it in books or notebooks. Do not make unnecessary markings or writings on the documents. Another thing to be avoided is to smudge the documents with any other liquid or chemical. Labeling should not be direct on the documents. The documents presented are all bound for examination and should be handled with care.