interestingly, i was able to make it to india (through the security checkpoints at IAD and FRA) with the blade in my double edge safety razor.
the folks running security at ATQ on my return saw it and asked me to dispose of it.
i was surprisingly pleased that i was able to shave while i was there (albeit i only shaved once during my week long trip). IAD security has asked me to either check my bag or toss the blade in the past.
and it wasn't a big deal that it got tossed on the return. if i had remembered, i would actually have tossed it before returning to make the process of going through security easier.
surprisingly, they didn't object to my nail clippers either way - which, mind you, have a pokey nail file that slides out.
my friend traveling with me was traveling with a neti pot and salt for preparing a saline solution (getting over a cold). IAD security was concerned about the salt and tested it to see if it was an explosive.