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Prussian Blue
As a general note on Prussian Blue, we advise doing one's own lightfastness tests in different white paints to see how this pigment may behave. Some preliminary research may indicate that the lightfastness of PB27 may be affected by the use of various mixing whites. One resource on this topic is a video from Rublev/Natural Pigments which shows their tests from their own variety of Prussian Blue (PB27) in various mixing whites. In this case the combination with white created different lightfastness ratings: https://www.youtube.com/live/xFn74zdaDHc?feature=share&t=1286.
Regarding Charvin’s brand in general, it is very possible that there might be pigments included in the paint which are not listed on the label. This also has potential implications regarding zinc white in their pastel convenience mixes. We reached out to Charvin about pigment composition and we were directed to their brochure. In a handful of cases the color of the paints and the pigment listings seemed to be at variance with one another (for example we saw pastel colors which did not disclose white pigment and only listed a high chroma pigment, or in another case, there was a green that only had a yellow pigment listed). Given the lack of certainty about the composition of the pigments, we feel it’s safe to say we do not know the full pigment contents. It might also be helpful to mention some differences between their two lines of paint, Extra-Fine and Super Fine. The Super Fine series has fewer colors, and each color is only available in 150ml quantities. Their Extra-Fine Series has a broader range and the paint comes in multiple sizes.
