Salz pencil.

On the top of the sketches from the doc's office, done with watercolor Faber-Castell Albrecht Durer pencil, I drew my antique "Salz" pencil, dated April 14 1925. Thin paper struggles to accept ink from Kuretake brush pens I used. I heard Fabriano sketchbooks with tinted paper is thicker. Watercolor pencil is very weak on brown paper, may be I should try it on white?