Silver test
Publicado: 06 Abr 2010 09:39
The Silver test is what the Anglo Saxons used for testing the special stamp papers their Post Office introduced to prevent a re-use of postage stamps after washing off the cancellations.
In the coating applied on the surface of the stamp, the chalk reacts to a silver object, a coin or so...
Several stamps of the UK and the Commonwealth exist both on "normal" paper as on "chalky" paper with the Chalky version often getting a much higher price...
Of the 3 stamps only the utmost right stamp had a coating!
But what had happened to the back of the stamps????
In the coating applied on the surface of the stamp, the chalk reacts to a silver object, a coin or so...
Several stamps of the UK and the Commonwealth exist both on "normal" paper as on "chalky" paper with the Chalky version often getting a much higher price...
Of the 3 stamps only the utmost right stamp had a coating!
But what had happened to the back of the stamps????