"silk screen" process. These are blocks of solid color. A very thin epoxy coat protects the color material from scratching. 4-color process 4-color process, a.k.a. offset printing, allows for bleeds and blends of colors, as is used in magazines. The colors are printed in the traditional CMYK process. This style is can be used for complex art and photo reproduction. An unlimited number of colors can be used. Backside The backside of a lapel pin holds the pin in place, and attachment pieces come in a variety of styles. Butterfly clutch – One of the most popular modern methods of attaching pins is the butterfly clutch, sometimes called a military clutch. The back of the pin has a small prong attached and when the butterfly clutch is squeezed and pulled up from the prong the pin is released from the clutch. Butterfly clutches may be made out of metal, plastic, or rubber. Also known as a dammit. Jewelry clutch – The jewelry clutch, or tie tack, is a simple but elegant design. The clutch locks into place when it covers the prong. Safety clasp – A safety clasp is similar to a safety pin in design. A long pin prong tucks under a small hook or clasp to hold the pin in place. Magnetic clasp – Magnetic clasps are composed of a small disc magnet that is attracted to another magnet that is attached to the back of the pin. Although this method is generally less secure, it is designed to prevent hole punctures in garments. Bar magnet clasps help disperse the tension with two sets of magnets. Screw and nut – A screw and nut clasp is one of the most secure. The prong is threaded so that the nut screws into place to hold the pin firmly. Stick pin – A stick pin has a thin needle with a collar that slides up and down the needle to secure or release the pin. See also Award pin Boutonnière Brooch Collar pin Campaign button Disney pin trading Kim Il-sung and Kim Jong-il badges Pin Pin-back button Pin trading References External links Award items Badges Fashion accessories