Be Sherlock Holmes!

You don't like others drinking out of your glass? There is an easy way to find out who it was ;-)!

What you need:

•  a tape
•  a pencil
•  a piece of paper
•  some graphite powder
•  a brush
• ink-pad
  
• a drinking glass
• a magnifying glass
  
• fingerprints :-)!

If you want to find out who drank out of your glass before, you can check whether you can find some fingerprints on the glass. You can be sure that if someone drank out of the glass before, you will find some prints, as everyone leaves prints, when he touches things. As everybody has different fingerprints you should be able to find out who it was.

What you should do next: take the graphite powder and brush it over the fingerprint on the glass. Then you take a piece of tape and make a copy of the fingerprint. After that you can stick the tape on a piece of paper.

Now you have to look for people that could have drunk out of your glass and take a fingerprint of them too.

You draw with the pencil a thick dark dot on the paper, put the finger of the suspect onto it and then fix the print with the tape.You can also take an ink-pad if you like.

Comparing the prints with the one taken on the glass you should find out who it was.

 Be careful and don't forget to check your own fingerprint as well ;-)!