This encouraged me to do a test on all the Shinhan paints that I have so I made a swatch as seen below :
|Here is the swatch before it was cut and exposed. 7.5" x 5.5" 300g Arches CP|
Here is the list of the paints I've used :
Permanent Yellow Deep(PY83)
Cobalt Blue Hue(PB29)
Davy's Gray(PBk31,PG17, PW6 )
Neutral Tint (Pb66, Pbk11)
Notice that some colors like Permanent Magenta(PV19) and Permanent Rose(PV19) have the same CI (Color Index number). This happens even with other brands and it is not a bad thing. Usually pigments may have other trace amounts of compounds/or impurities like silica magnesium, aluminum etc. and may bias towards certain hue during the manufacturing process. Another pigment that has this quality PR101 which is a synthetic iron oxide.
There is also PG7 which is marketed as Viridian but is actually Phthalocyanine Green which is really known to be light-fast(Though true Viridian PG18 is known to be light-fast as well ). This is when learning a pigments CI number pays off :).
|Half of the swatches to be exposed are pasted into an illustration board with the binder clip to make it stand.|
|Unless it is cloudy or raining, this is how the swatch was was exposed. The photo was taken at about 1pm.|
|I came to check after a week of exposure(April 28 - May 10). The swatches on the left are the ones not exposed. No noticeable difference. Boring :)|
|After a month (June 10)|
|Finally August 10|
I would have to admit that my testing was a sloppy job, I did not make decent gradient in all of the swatches. It was just supposed to be a quick and dirty test. Yet, the results are quite surprising. Unfortunately, these are the only colors from Shinhan that I have, so my test results are limited to these colors. I will continue to leave this on my window on in the next few months, and see if something comes up.
If this test proves to be successful, it is good news for all of us since we have an affordable professional quality grade paints as alternative to better known brands that performs just the same.
If you are interested in doing your own light-fast testing, you may want to check out Wetcanvas and Handprint for a more detailed procedure.