Re-Certification. Certified Studio by Hahnemühle Re-Certification. Certified Studio by Hahnemühle Re-Certification. Certified Studio by Hahnemühle “Re-Certification” of the Certified Studio obtained in 2013 as we have maintained our commitment of excellence in the production of giclee prints. Re-Certification. Certified Studio by HahnemühleGraficArtPrints2020-07-02T08:38:32+00:00