I just got a ph tester pen and checked the photos I get from Walgreens -- the back tested fine, but the front was acidic. Is this normal? Does this mean Walgreens prints fail the "archival quality" test? Where do you all get your acid-free prints? How do Target prints rate for archival quality? I suppose someday I'll have more sophisticated concerns in photo printing, but my immediate concern is whether the layouts I'm creating will age prematurely and where I should be getting my photos printed.