If you take several different medications, it can be very difficult to keep track of which pill is which. You might also occasionally find a stray pill around the house. If you need to identify a pill for any reasons, there are several options you can use. However, none of these methods are failsafe. Consult a doctor or pharmacist before taking any pill you find.
Bellow you find a video, with pictures. Just follow those steps and you will be all right!
More info: youtube.com