Anthony, Has I understand it PMK pyro is the same formula as Gordon Hutchings. It's in powder form and also available from Silverprint, London. However FilmPlus market this as a liquid pyro dev. as bath A and B and is available from Creative Monochrome Ltd. Tel.020 8686 3282, e-mail cremono@btclick.com. It costs about £11 and is superb, well worth getting. Regards,(posted 8604 days ago)