I've experimented with Powdered Graphite and Water Soluble Graphite. Here is a demo video of the paintable graphite.
Powdered Graphite and Water Soluble Graphite for Drawing and Painting - Belinda Del Pesco
Global Art ArtGraf Water-Soluble Graphite Powder
Water Soluble Graphite - Review of ArtGraf - erasable graphite painted on paper
Water soluble Graphite and Carbon — NUTTDRAWS
The Versatility of Graphite. From Light to Bold, Dry to Wet.
Field Sketching in Watercolor - Belinda Del Pesco
Water Soluble Graphite demo video - Little Jay - Belinda Del Pesco
Viarco Artgraf water soluble graphite review a lovely new watercolor medium to try
Antique Metal Candlestick Burning Candle Stock Photo 49121026 Shutterstock