This document discusses various types of physical evidence that may indicate a document has been altered or forged, including folds and creases, impressions from items like paper clips, cancellation stamps, erasures achieved by rubbing the paper's surface, blots and smears that could hide marks, trimmed dimensions, perforations and irregular tears, unsymmetrical outlines of adhesive stamps, and holes or tears that may hide forgeries. It also mentions detecting chemical erasures on the surface and examining wire marks and watermarks in the paper.

2. 
 lines that indicates that the document was folded or
kept in a small container.
Fold and creases

3. 
 like that of a paper clip, stamp pads, and the like.
Impressions

4. 
 indications that some of the part of the documents
were cancelled.
Cancellation stamps

5. 
 by rubbing the surface of the paper resulting in the
reduction of the thickness of the paper.
Erasures

6. 
 to detect any chemical erasures.
Surface

7. 
 blots are used by forgers to hide a mark; smears are
a result of contact with other documents
Blots and smears

8. 
 trimming of the original document can be used to
eliminate an important part of the document.
Dimensions

9. 
 Perforations slight irregularities in tearing.
Perforations

10. 
 Stamp if examined , will sometimes reveal
unsymmetrical outline due to perforations.
Adhesive stamps

11. 
 used to hide deliberate acts of forgery.
 E.g. a hole for fastening a sheet together.
Holes and tears

12. 
 markings in the paper itself.
Wire marks and watermarks