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Dr. Wilhelm has given Concorde a 100 years plus rating with Roland's pigmented inks. The paper "has archival properties", otherwise this rating would not be possible. Different inks will react different with Concorde Rag or any other media. Legion West submitted Concorde Rag for testing with the Lysonic E series ink to Dr. Wilhelm last April and as we all know, the results are still pending. Legion West has not submitted Concorde for testing with the MIS inks. MIS claims longevity for their inks on a variety of substrates but third party confirmation of the longevity on any substrate is still pending. I think this is why it is necessary to get third party confirmation to support longevity claims. It would be ideal if we had the horse before the cart (longevity testing done before product release) but this is not likely to occur in the near future. I personally believe that it is best for the manufacturers to understate longevity claims until the third party confirmation is available. Whether this is happening remains to be seen. If any manufacturer overstates the results, this will obviously hurt all parties concerned i.e. user, retailers and manufacturers. Daryl Clark service@dygraphics.com http://www.dygraphics.com 888-786-8832 (Number is back on line) 760-735-8832 - ** Tips on Refilling, Refill Kits, Archival Ink, Cartridges, Paper ** ** Order On-Line http://www.missupply.com Save $$$$ ** ** MIS ASSOCIATES, INC 800-445-8296 Kits Ship Free! **