The principle behind Graffito is that works exactly like carbon paper. The Graffito sheets are embedded with a ceramic underglaze that will transfer to bisqueware when drawn upon using a pen or pencil.
Carbon Copy: Transfer Paper Makes it Easy to Transfer Customized Underglaze Images
Underglazed and carved ceramic mugs - RD Ceramics
How to Get Stunning Results With Underglaze Transfers - The Art of Education University
Carbon Copy: Transfer Paper Makes it Easy to Transfer Customized Underglaze Images
Graffito Kit #1 Package Of 6 Sheets – Ksa Your ceramic store
Minnesota Clay Graffito Paper – Sounding Stone
Clay Planet - Ceramic Supplies, Clay & Glaze Manufacturer - Underglaze Transfer Designs
Clay Carbon Paper - The Ceramic Shop
Graphite Transfer Paper (Single, Reusable Sheet) — The Pottery Piazza