article_snippet: This footage has also revealed the differences between dry and hydrated skin and beard hair.
article_snippet: When hydrated, skin is also tighter (an image of skin is shown before washing left and after washing right).
article_snippet: This exposes more of the hair's surface area to the blade.  
article_snippet: This image is a microscopic image of cut hairs on dehydrated skin.
article_snippet: Dry hair can have the strength of copper wire and when hair and skin hydrates skin swells and makes the hair easier to cut. 
article_snippet: this increases the surface area that the blades can cut through, and when hydrated, skin is plumper, which reveals more of the hair.
article_snippet: Allowing water to penetrate the hair is key for a comfortable and close shave because dry hair is difficult to cut,' explained Dr Vanoosthuyze. '
article_snippet: In fact, dry hair can have the strength of copper wire.
article_snippet: When hair hydrates, it swells and becomes easier to cut. '
highlights_snippet: Scanning electron microscopy shows difference between dry and wet skin .
  