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I'm not toooo sure what it is but it has a picture that says do not open unless in a photographic darkroom & 225 sheets weigh 50 lbs or so.....thought someone may be interested... (not mine) regards Andy Schmitt AAndy LLC Computer Systems Created Perplexed Users UnPerplexed Dragons Slain,Ideas Generated Photographs Taken http://www.aandy.org Photography Head, Peters Valley Craft Center