Taken from a glossary of stamp terms:
Quote:
Varnish Lines: These lines were a security device and were applied to some stamps as a way to prevent them being cleaned and re-used.Bars of varnish were applied to Austrian stamps between 1901 and 1907 and to Russian stamps between 1908 and 1918. In the case of Russia the lines were applied in a trellis pattern.
Mention is made of it in this Linn's Refresher Course article, too:
http://www.linns.com/howto/refreshe...rcourse.aspx
Posted 07/08/2014 12:52 pm
