'(<a href="http://www.j-archive.com/media/2010-01-04_DJ_19.wmv">Kelly of the Clue Crew shows a stamp on the monitor.</a>)  In the authentication process of certain <a href="http://www.j-archive.com/media/2010-01-04_DJ_19.jpg" target="_blank">stamps</a>, detection fluid is applied to the <a href="http://www.j-archive.com/media/2010-01-04_DJ_19a.jpg" target="_blank">back</a>, revealing <a href="http://www.j-archive.com/media/2010-01-04_DJ_19b.jpg" target="_blank">this</a> type of transparent impression'
a watermark
STAMP COLLECTING: In the authentication process of certain stamps, detection fluid is applied to the back, revealing this type of transparent impression
In the authentication process of certain stamps, detection fluid is applied to the back, revealing this type of transparent impression
In the authentication process of certain stamps, detection fluid is applied to the back, revealing this type of transparent impression
STAMP COLLECTING
a watermark
STAMP COLLECTING