Charcoal is more of a makie material but can be used in kintsugi as a cleaning powder. You use it to clean the surface of the piece after you have mixed it with some water.
Kintsugi materials, charcoal

Charcoal is more of a makie material but can be used in kintsugi as a cleaning powder. You use it to clean the surface of the piece after you have mixed it with some water.
Kintsugi materials, charcoal