text on cover: Warning / the print contained in this folder is hazardous / and should not be placed in direct contact with other artworks.; text on inside: Hidden Hand was created at the London Print Studio by John Phillips / with the assistance of art dealer Paul Stolper and artist Kate Barker. / Hidden Hand is printed invisibly. The latent image may be revealed by gently manoeuvring the print over a naked flame. / However, an attempt to reveal the image may result in the partial or / total destruction of the artwork.
Experimental Printmaking Institute, Easton, Pennsylvania; acquired 2008 by the National Gallery of Art