Does 5 tests Doing the test is EZ: Step 1: First, fill the red field on the instruction leaflet with powder (this is approx. 10 milligram.). No rocks or lumps! Step 2: Add the contents of both tubes to the bottle of liquid. You will see a greenish upper layer form. Step 3: Now add the cocaine to the bottle , close the bottle again and shake for 2 seconds. Step 4: As a result, you will see a color change in the lower layer. Compare this to the colorizations that are shown on the leaflet. The murkier and darker it gets, the more cocaine is present. If the color change is still transparant and shows a light to medium brown color, the coke has been cut quite a bit. This color scheme comes with the instructions. The results from the tests done above can be read as follows: The bottle on the far left has almost no cocaine in it. It is not even worth 1 star (it actually was a 10% pure sample). The second bottle is between 2 and 3 star quality (this was a 50% pure sample, very common to find on the street!).The third bottle was an 70% pure sample and gets 4 stars from us. The last bottle, where the bottom layer is almost like coffee was a 90% pure sample and rightfully deserves 5 stars! The last 2 colors is what you should be looking for!