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Just FYI for future generations reading this question, Adobe is selling Studet & Teacher versions of their software at HUGE discounts (like, 70-90% off the normal price). You can't resell that software, and are allowed to use it only on your own machine, but it can be a great deal if you're in the right situation.
great - I'll play around with it and see what happens. If I need further info, I'll follow up here. Otherwise, using pencils with a different colour sounds like the sanest option.
Cool ideas, thanks! Coloured pencils are a good option. From old experience, they don't handle as well as normal ones, but I may get myself a set and try out. I'll test suggestion 2) before that though - there is a significant difference between the black of the lines and the grey of the pencil. I'll let you know how it worked out. Re the tablet, I recently got one (a A5 Bamboo) but I use it for post-processing and colouring only - I love the freedom of pen and paper for sketching too much.