A very interesting collection in Trove by Dorothy Cross, from the various National Collections.
I hazarded a quess at the materials used in the sketches by the artists!
Lisa. (Pencil sketch)
Harry (Ink and conte)
Philip (Watercolour and pen)
Des ( Coloured pencil)
Mary S ( WC pencils)?
Stephen C (Watercolour)
Balazs (Pen and ink)
Patricia (Watercolour and WC Pencil)?
Jane (Coloured pencils and Black Marker)?
Jessica (pencil and coloured pencil)
Mary O'C (Bic Biro, medium )