The Certificates of Authenticity issued by the Edward Dwurnik Foundation are documents which constitute final confirmation of the authenticity of a given work. Each Certificate contains basic information on the work it refers to, has the numbering and is competed by hand by the Foundation employee and signed by Apolonia Dwurnik, the President. Additional information regarding the work is often provided on the reverse of the Certificate. The archives of the Foundation contain photocopies of all certificates issued by the Foundation.
Two types of Certificates of Authenticity are issued by the Edward Dwurnik Foundation:
— unpaid, when the artwork is purchased at the Raster Gallery,
— paid, when the Certificate is issued on an individual request.