Hi. A quick question.
When using ink for underdrawing I am assuming it must be a shellac based ink and not acrylic since the acrylics would probably cause adhesion issues.
How do I know if an ink is shellac based. The inks I use normally (Dr Martin's Bombay India Ink - both black and colored) do not list their ingredients, either on the bottle or on the web.
Does anyone know if they are OK for tempera underdrawings?