Something Blue

Here I am using the Lamy pen with it's original blue cartridge but with Lexington Gray ink added to what I thought was a near empty cartridge.  Evidently not because it's still feeding the blue.  I did notice with the second sketch that the blue is looking darker.....particularly in the notes which were added last.    Lexington Gray is not water soluble but the blue is.

Both done in the Daler Rowney 4 x 6 sketchbook with cartridge paper.