Posted By:
RobWas wondering if there was a paper conservator around here to with techniques on dealing with paper, or cardboard in this case.
If the grade doesn't get affected by the curling, no need to try to flatten (not overly curled). Tried flatten a rather inexpensive 1930-ish British photographic card, got a nice big fat crease for the efforts, no need to do that again with a more pricey card. Card looks more a "4", with a closer examination, with a slight ding (although better eye appeal), so couldn't expect a 5 or better anyway.