Type I versus Type II : I'm a little confused

[HRBAKER]

Originally Posted by shimozukawa

I believe that at the decade level, available photographic paper and chemicals enter into the equation. Even if a company was selling 1923 paper stock in 1940, the chemicals used in 1940 would be of a different formulation than those used in the 1920s. For the same example, if the chemicals were from the 1930s, they would be the same formulation, but the effect would be different on the paper. Also, exposure technology from the time period would affect how the images came out.

It might be less of an issue with digital photography than film, since printer makers change their ink formulations regularly to bolster sales.

This is similar (in a way) to how the Star Company's cards from the 1980s went from super scarce to not nearly as scarce, overnight. The original manufacturers of the cards sold the machines, plates, paper and processing equipment. As a result, someone could produce the same exact cards... en masse... or at least until they ran out of the original paper... or the original cutting blades dulled out.

OK, so PSA and Beckett have engaged qualified chemical analysts then? I see your point I'm just being the dev's advocate here because we are being asked to take a leap of faith here. Maybe it is all very simple and I have become very jaded, that's entirely possible. I can tell you that in the amount of time that I believe that is spent on any card or photo being graded there is no sophisticated chemical analysis going on most likely.