For those who are surprised at the hardness of toilet paper and or paper towels, find a bare aluminum object and rub toilet paper or paper towels on its surface. Really hard with a lot of pressure. It won’t take much for black swarf to become visible on the paper as a fine black powder of aluminum is ground off.
For those who are surprised at the hardness of toilet paper and or paper towels, find a bare aluminum object and rub toilet paper or paper towels on its surface. Really hard with a lot of pressure. It won’t take much for black swarf to become visible on the paper as a fine black powder of aluminum is ground off.