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Robert,
What you can do to test for lightfastness is make up a sample drawing (or scribble) on your regular paper, cover half of it with solid black card and put it under glass in a sunny spot for a few weeks. Examine it every so often and if there is no fading after a reasonable period of time, you know you have a product that will stand the test of time.
Usually you don't notice fading if the whole piece fades because your eyes adjust to the changes.
The other thing you need to consider is the paper you draw on because if it has an acid content, it will yellow and go blotchy in a few year (old newspaper being the best example). Also if the ink base in the pen is acid it can cause problems.
You will probably find that the pens are OK. I am a bit pedantic about this subject because I have lost a few pieces along the way through inadvertently using inferior materials.
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Margaret Port
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