If you’d like to give the idea that you’re a touch on the deranged side, leave these little bars of soap out in the guest bathroom. Not only is it a razor blade tucked inside of a bar of soap, but over time it becomes a very rusty razor blade. I wouldn’t advise using this bar of clear glycerin soap and actually neither would the sellers. You can purchase your very own bar to weird out guests for $6.95.
Source: NerdApproved
How could the razorblade become rusty? As long as it is still encrusted by the soap, it would be totally shut away from the air and water. Unless the soap itself is a corrosive agent…