An ink light fastness test

This test was made under realistic but accelerated conditions, it's not comprehensive, I've just used most of the inks I had at hand earlier this year.

Testing was performed by writing on two different kinds of paper and cutting a strip of each of them and taping on the inside of a window (facing east, I live pretty far north and during the testing period of Jan/Feb to May it's often cloudy here). So while accelerated, the conditions have not included stronger light nor other wavelengths than you can get indoors, it's just that papers don't usually get direct sunlight 3-6 h/day.

There were few differences between the two papers.

Paker Quink Black
Faded brownish.
Pelikan Brilliand Black
Faded very slightly to brownish, best of the fountain pen inks in this trial.
Mont Blanc Black
Faded to faint or very faint reddish brown.
Waterman Black
Faded brownish.
Pelikan Royal Blue
Very faint.
Waterman Florida Blue
Faint.
Parker Quink Turqoise
Faded.
Shaeffer Peacock Blue
Totally faded.
Waterman Havana
Slightly faded.
Parker Penman Mocha
Very faded.
Parker Penman Ruby
Very faded, nearly illegible.
Shaeffer Red
Very faded, nearly illegible.
Pilot G-2 Black
Slightly faded.
Rotring rollerball black
Has turned brownish, very little fading.
Pilot G-2 Blue
Faded noticably.
Rotring rollerball blue
Totally faded, slight reddish remains.
Fisher ballpoint black
Hardly noticable fading.
Parker rollerball blue
Very faded, faint reddish remains.
Cross Ion Midnight Blue
Faded to grey-black.
Parker Gel Blue
Very faded, faint reddish remains.

The top section was tested from Jan 15:th, the middle from Feb 2:nd and the last from Feb 16:th, all tests stopped on May 11:th. I had planned on running the test longer, but I stopped when the first colours had been totally wiped out.