I've got several 16 gram foil envelopes of Perfection XR-1 film developer -- powder inside. Unfortunately, there are no directions printed on the envelope as to suggested diltuion, time/temp, etc. There are a lot of posts about the XR-1 formula, but so far I've not been able to find a PDF or copy online of a spec sheet from the manufacturer. Darkroom Techniques June 1981 apparently had an article on XR-1, but I've not found that issue in online archives. So -- does anyone have any info as provided by the manufacturer? I'd appreciate a copy if you're willing. Thanks.