Disclaimer: I am not responsible for what you do with this, used properly it should be relatively safe, but as anytime you deal with fire BE CAREFUL.
Also, it has been brought to my attention that acetone is carcinogenic, so don't use it.
Step 1: Materials:
Razor knife/Exacto knife(any sharp knife could be used)
Awl(or some other sharp pointed object)
You will also need two empty pop cans, I have three in the picture, because I was drinking out of one while i worked(very thirsty work you know).
Step 2: Cut the bottoms off
Now, on the second one your going to want to cut about 3/4 of an inch above the bottom of the label.