When fixing b&w double weight fiber base papers I discovered as have others that by using Kodak Rapid fixer and omitting the hardener (solution B) I could reduce significantly the amount of curl in the dried print. Later, however, when I started using an archival washer I experimented with Kodak Fixer again just to see if thoroughness of washing is a factor in determining curl, and sure enough the archivally washed prints curl so little when dried that I decided to skip the extra expense and inconvenience of working with Rapid Fixer. This result may of course be an artifact of my own casual not-very- scientific methods, but however that my be I'm now wondering if curl is all there is involved in the use or non-use of the hardener. Are other variables in play here? The paper's receptivity to toning? Ability to withstand the heat of dry-mount pressing? Longevity? Something else I haven't thought of? Thanks in advance for any replies.