Kirkland glossy RC paper is not a premium archival material. And, there are MANY similar papers on the market, Kirkland is nothing special... Costco didn't made them, they buy from other real manufactories. Sorry for break your Kirkland myth, but you need to tell others your spec requirement not how you love Kirkland papers.
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Kang-Wei Hsu
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Effect of Fixatives on Inkjet Papers Preservation and Imaging Quality
Kang-Wei Hsu