Two-Way Mirror or Not

This morning I was reading the RV Travel blog and found some interesting info I thought would be good to pass on to everyone who reads this blog, even though it has nothing to do with Camper Prep: How to tell if a mirror is two-way or not. To quote the blog (http://www.rvtravel.com/rvforum/viewtopic.php?t=6381):

Do you know how to determine if a mirror is 2-way or not? This is not to scare you, but to make you aware. A policewoman who travels all over the US, and gives seminars and techniques for businesswomen passed this on. When we visit toilets, bathrooms, hotel rooms, changing rooms, etc., how many of you know for sure that the seemingly ordinary mirror hanging on the wall is a real mirror or actually a 2-way mirror (i.e., they can see you, but you can't see them)?

There have been many cases of people installing 2-way mirrors in female changing rooms. It is very difficult to positively identify the surface by just looking at it.

So how do we determine with any amount of certainty what type of mirror we are looking at? Just conduct this simple test: Place the tip of your fingernail against the reflective surface and if there is a GAP between your fingernail and the image of the nail, then it is a GENUINE mirror.

However, if your fingernail DIRECTLY TOUCHES the image of your nail, then BEWARE FOR IT IS A 2-WAY MIRROR! "No Space, Leave the Place." So remember, every time you see a mirror, do the "fingernail test." It doesn't cost you anything. Remember: "No Space, Leave the Place."

Ladies: Share this with your girlfriends, sisters, daughters, etc.

Men: Share this with your wives, daughters, daughters-in-law, mothers, girlfriends and friends.