I was just wondering if anyone here can give me some advice about older, unused blades. I see really old blades (from 40 years ago or more) on eBay, and I would never shave with them. But what is the shelf life of a DE blade? My dad says he has some that are probably between 10 and 20 years old. Can they be used? How do they age? And how do storing conditions like heat, cold, moisture affect them? I have hundreds of blades and have offered to give him lots of them, but he says he wants to use his old ones first. He's using the derbys I gave him right now, but I am just wondering if he should use those older blades that he has. Any info would be appreciated.
Thanks.
Thanks.