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When you draw on a balloon (not inflated) with a black marker pen, it comes out.. very BLACK.Then when you blow it up, the black lines turn grey.Why is this? Obviously it's to do with it stretching.. But..
Ohhhh.h...... But is this because, your eye's are playing tricks on you?
I would think that you are extending the area over which the ink is spread so the colour 'saturation' is reduced. Just like the difference in colouring a small piece of paper and colouring a much larger piece with the same amount of ink.