Looking at this picture for the first time, it seems that the artist used ink and black wash only. On closer inspection we see subtle hues of purple. This print was released in Japan, at prestigious Toppan Studio, where the image was embossed giving the print an etching-like quality. 

Limited Edition Offset Lithograph
with artist's silkscreen signature
1993 Edition 500, with 50 Artist's Proofs
Paper size approx. 13" x 11 1/2"
Image size approx. 7" x 5"