I raised this question with Ilford themselves when they stopped making their own kit. They didn't even bother to answer. I feel that Photocolor II is not as sharp as the Ilford kit although perhaps the tonal range is better - but that may be an illusion. With regard to unopened kits - our local supplier had one on his shelf for two years - I peeled off the price sticker and it had to rises !! I didn't buy it. Good luck I hope it's ok but the thought of a hard won collection of pictures being underdeveloped would put me off. I'll give you an award for bravery.(posted 8587 days ago)