These days I am just doing experiments, and today I saw a very interesting machine in the lab. The picture is showing the machine, and it is called Gas Chromatograph. If the experiments you did that makes you think you added the wrong material, you can use it to test if you really did wrong or not. You can put the sample that you think is wrong in it, and also put the right sample in it. If they match together, that means they are the same, the computer will show you.
