The security watermarks is an identifying image or pattern in paper that appears as various shades of lightness or darkness (white watermarks paper or black watermarks paper)when viewed by transmitted light, caused by thickness or densit variations in the security watermarks paper.
Watermarks have been used on security stamps, currency, security certificates and other government documents to discourage counterfeiting.
advisoryThe printing security postal stamps have several inbuilt security features in them to ensure that they are not easily counterfeited, although the design on the security postal stamps may appear to be very simple.
The security of passports and certificates to avoid frauds and to perform customs control is very important.