Classification and introduces all kinds of buttons

For the buttons, I believe every one of us will be familiar. Whether our everyday wear clothing, bag or shoes, or normal can always search the button of "figure". Button as a kind of commonly used clothing supplementary material, it is indispensable in our daily life. Button, then, what are the types and their respective function?
 

Craft buttons
Automatic system of this kind of button can't use now deduct machining, but only by manual cutting, planing, grinding, file, etc. This kind of buttons in the production process are fine, so the production efficiency is low, the processing cost is high, the production of products is also more like arts and crafts, therefore calls craft buttons. Chic and elegant not only, still can make the shape of a natural object, such as leaves, moon don't needle, etc., the grade of the product is higher, has certain development potential.

Button, the film shot in a murder scene, wood floor because the penetration of dark red, deep red blood land