I have purchased on ebay several brands and types of color slide film stored frozen for > 15 years and noted the effect, that despite an at most moderate change in color rendition and a slightly lower maximum density, the effective speed appears to have increased.
Fujichrome RD100, RDP100, Ektachrome 100HC, Agfachrome RS100 and Konica Chrome R-100 gave reasonable results with a tight exposure, but they don't tolerate the generous exposure recommended for reproduction (scanning). Absolutely blown-out came Ektachrome 400, which had also lost maximum density beyond usability. Maybe push exposure (800 ASA) and pull processing (200 ASA) could correct this imbalance, but I need to try this.
The 100 ASA films appear to have gained about 1/2 f/stop (Fuji, Kodak, Konica) up to 1 f/stop (Agfa) in effective speed, while showing a still sufficient density with a very slight bluish cast. The colors are also somewhat on the cool side, but I think that this shift could be compensated by fine tuning of the color processing step.
Until now, I have read about radiation fogging of negative film and hypersensitization either by by heat-induced accelerated aging or pre-flashing, but not about such a sensitizing long-time storage effect with frozen slide film. A forgotten cartridge of Super 8 Kodachrome 25 frozen at about 1980 did not show noticeable deterioration when exposed and processed in 2005, according to a German amateur movie magazine. But it would be interesting to hear about other's experiences with long-time frozen-stored color slide film to confirm such assumptions.
Fujichrome RD100, RDP100, Ektachrome 100HC, Agfachrome RS100 and Konica Chrome R-100 gave reasonable results with a tight exposure, but they don't tolerate the generous exposure recommended for reproduction (scanning). Absolutely blown-out came Ektachrome 400, which had also lost maximum density beyond usability. Maybe push exposure (800 ASA) and pull processing (200 ASA) could correct this imbalance, but I need to try this.
The 100 ASA films appear to have gained about 1/2 f/stop (Fuji, Kodak, Konica) up to 1 f/stop (Agfa) in effective speed, while showing a still sufficient density with a very slight bluish cast. The colors are also somewhat on the cool side, but I think that this shift could be compensated by fine tuning of the color processing step.
Until now, I have read about radiation fogging of negative film and hypersensitization either by by heat-induced accelerated aging or pre-flashing, but not about such a sensitizing long-time storage effect with frozen slide film. A forgotten cartridge of Super 8 Kodachrome 25 frozen at about 1980 did not show noticeable deterioration when exposed and processed in 2005, according to a German amateur movie magazine. But it would be interesting to hear about other's experiences with long-time frozen-stored color slide film to confirm such assumptions.
