 Now that we've explained how the hardness tests work, we're going to go ahead and perform that test with our sample things. Now we're going to start with the softest material, which is talc, and I don't expect that talc is going to be hard enough to scratch any of these materials. And when I do the test, you hear the sound, that just lets you know the test is being done. I use my diamond again, to check, and when I move the diamond over each one, I see that none of them had to turn over, so none of them had any scratches from the talc. The next harder one is the fingernail. When I use my diamond here, you see the sulfur turned over. That means the sulfur was scratched by the fingernail. So in your chart, none of them get marked as being scratched by the talc, but the sulfur will get marked as being scratched by the fingernail. Next hardest one is the penny. I'll check again using the diamond, and you should have seen a couple of them flip over, meaning they were scratched by the penny. Next one would be the glass, checking with the diamond to see which ones are turned over. Moving on to the nail, checking after the nail comes topaz and checking by hovering the diamond over them. Record your results in your lab manual and contact me if you have any questions.