RAW Classic Papers are made from the purest naturally unrefined plant fibers and are finished with a natural tree sap gumline. Each sheet is steam watermarked with our proprietary criss-cross imprint for a smooth, even burn.steam watermarked with our proprietary criss-cross imprint for a smooth, even burn. RAW Classic Papers are made from the purest naturally unrefined plant fibers and are finished with a natural tree sap gumline. Each sheet is steam watermarked with our proprietary criss-cross imprint for a smooth, even burn.