The Original ReproFX Spirit™ Tattoo Thermal Image Copier Paper is a quality tool for artists to have in the shop and is compatible with all thermal printers. Each sheet / roll contains four parts:

The top layer is white and will be where the image transfers onto
The second layer is milky white, not bound, and is typically thrown away
The third layer is the carbon piece (blue/purple) and is what is transferred onto the upper sheet
The fourth layer is yellow and holds the original in place while using a stencil copy machine