god the time i spent washing out ink pens in the sinks was horrendous, i even resorted to taking the pens on holiday for 2 weeks once to avoid the dreaded monday morning dried out pen.
we used to draw on vellum after the linen was replaced, and my old section leader would come around with his pipe alight, take a look at the scheme and blow down the pipe, the following shower of sparks would ignite lots of little holes in the vellum which then had to be designed around, which is why the core fairings on the E4 are the shape they are
