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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.
As a general note, there is a lot of overlap in the names between Charvin’s Super Fine series and their Extra-Fine series. The Super Fine Series is sometimes just referred to as the Fine series, and the tubes only come in 150ml quantities. In contrast, the Extra-Fine Series has a range of sizes. On another topic, there is a bit of uncertainty in general about which pigments are used in any given paint. We reached out to Charvin about some questions that came up and there was not any greater clarity. Some pastel convenience blends of theirs only list a high chroma colorant and do not disclose the white used. This could be an issue if zinc is used. Also there was a green with only a yellow pigment listed, so be aware that not every pigment may be included in their brand statements.
