Pressure And knives.

Well, tried an experiment with knives and Trying different pressure. Apparently If I apply Hard pressure, and slow sliding movement across my skin, it doesn't break skin about 70% of the time. If I apply a small amount of pressure, but drag the knife across my skin and a fast swipe, It causes a skin breaking scratch or cut, causing blood. I still don't have my data, that I want, or much information. I'm still not sure. I'll have to try again once I find another area to try. I used my lower leg, on the upper side. It has rougher skin. I should try the bottom of the lower leg, since it's softer skin. I should place Softer against Rougher skin. It would be a better test. Same pressure though. This is a data recorder. Since no one views this, It would be a great place to track my information.