Re: comparisions of inks using paper chromatography

[Kennedy McEwen <rkm@kennedym.demon.co.uk>]

In article <F73124AFD4114740AB4F48F9D2807C8D02E05B4C@ro-msgmbx-03>, 
"Gutierrez, Diane" <Diane.Gutierrez@westgroup.com> writes
>Have any of the members of this list ever compared the various ink
>manufacturers' products using paper chromatography?  This involves putting a
>premeasured drop of ink on the end of a absorbent paper strip and putting
>that end in a solvent (in this case, probably water or alcohol). The colors
>in the ink migrate through the paper, separating on the way to the other
>end. http://wwwchem.csustan.edu/chem1002/mrsketch.htm offers a simple
>method.

Well I haven't compared different inks, but I did try some 
chromatography during the early days of the Epson x70 Orange Plague 
fiasco when it was discovered that the black ink turned brown as well as 
the cyan fading.  It was suggested that the black ink was a composite of 
the other colours, so I made a test chromatogram with all four colours. 
That showed conclusively that the black ink was not a composite and 
hence it was not the cyan component of the black in which was causing 
the brown coloration.
-- 
Kennedy
Yes, Socrates himself is particularly missed;
A lovely little thinker, but a bugger when he's pissed.
Python Philosophers
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