Thermal Paper has 4 parts.
1) Top Layer is White. This is the Layer that Your Image will be Transfered onto.
2) Second Layer is not Bound and is a Milky White. Typically this Layer is Thrown Away.
3) Third Layer is the Carbon (purple/blue paper). By Pressing on this Layer the Purple/Blue coating is Transfered to the Upper Sheet.
4) Fourth Bottom Sheet is Yellow and Holds the Original in Place when Using a Stencil Copy Machine.
