Chalk paper is a type of safety paper that was designed to cause the stamp's design to rub off or smear when an attempt was made to remove the cancellation on the stamp. The paper was coated with a solution containing a suspension of chalk.
Chalk paper - Describes postage stamps printed on specially treated paper to receive a good printing impression and to resist the removal of cancellations.
Papel giz-aplainado: (Port.) chalk paper; stamp paper which has a coating of chalk or clay on the surface.
Papel Sellado: (Sp.) security paper watermark, 1872.
Papel tiza: (Sp.) chalky paper.
Papel verjurado: (Sp.) laid paper.
 See also: Used, Type, Perforations, Definitive, Die
  
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