Cork

Cork is a natural material that has popped up in the world of stamps.

Cork cancels often refer generally to the improvised killers/obliterators used mostly in the 19th Century. Designs could be carved out easily into the fancy cancels we know today. However, the material would not be very long-lasting under even in moderate use. With generations of whittlers with sharp pocket knives at hand, wood would be the common choice. Meanwhile, when they became common, rubber cork stoppers could also be used as a medium, often showing its molded size code in reverse in cancels.

More recently, maybe from a desperation for novelty products, thin cork sheeting with self adhesive backing used for bulletin boards has also become a medium for printing stamps.  File:Togo Pope Paul II.jpg|Togo Pope Paul II issue on... cork. 

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