Why do different brands of blue ballpoint ink have different odors?

Question

After using differnt brands of blue ballpoint pens, I've noticed that the inks smell differently from one another. I have not noticed this when using black pens.

Answer 1

Both black inks and blue inks from different pens/brands/etc. contain different components. You can verify this for yourself by doing a little paper chromatography:

http://www.yesmag.ca/projects/paper_chroma.html

Answer 2

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