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Having some experience in predictive analysis, I think we need a baseline for comparison on these archival issues. When Henry Wilhelm quotes years, people take this data as absolute. That is, if Henry says a particular paper/ink combination will last 7-9 years, many people assume their prints will be trash in 10 years with absolutely no thought given to application (i.e. direct sunlight exposure, surface unprotected, etc.). How many people actually know what his criteria is for fading? I'd assume not many. Anyway, giving absolute results (i.e. this combination will last for 8 years) is difficult business. You don't see this level of attention or concern given to "real" photographic prints because people have some level of expectation from them. That is, it's a known quantity, at least in the minds of people. In conducting many predictive analysis, we many times came to the conclusion that "directional" results are more stable than absolute results. Meaning we are testing 2 configurations, which one is better for engine cooling under 60 MPH, 95 degreee, 50% humidity conditions? Note, the analysis will deliver which one performs better (a directional result which points us in the direction of a satisfactory design). Not configuration A will have a radiator exhaust temperature of 182 degrees (this would be the case of an absolute result). With this in mind, it seems to me that making a Kodak or Fuiji paper a baseline, then testing and rating papers against that baseline under the same conditions would give us more information than a year rating. For instance, rating a particular ink/paper combination a 0.5 would mean that this combination lasts half as long as the baseline photographic print under the same test conditions. This would mean a lot more to me than the current year rating. ===== Explore potential income opportunities with Greer and Associates at http://www.ibocity.com/greeraa. Also, Come visit my digital photography web site along with a lot of other interesting stuff at http://www.greer.simplenet.com. Mike Greer __________________________________________________ Do You Yahoo!? Bid and sell for free at http://auctions.yahoo.com - Turn off HTML mail features. Keep quoted material short. Use accurate subject lines. http://www.leben.com/lists for list instructions.