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Purplish Blue Florets:
To top it off, in mid-August the flowers appear. They look like small artichokes (a very close relation) and are obviously thistles of a sort with many individual purplish blue florets. The spines around the blossoms are sharp. Blossoms continue to the end of October and plants withstand frost at least to - 28°F.In mixing colors with white, gray, or black pigments one will usually find that the resultant colors turn slightly blue. There is an unseen bluish element in these neutral pigments. Mixing any of these pigments with blue, the additional tinge is not visible; but mixing them with red or yellow, a purplish or greenish tinge will respectively be noticeable. This must be corrected in such mixtures by the addition of a slight amount of orange or yellow in the first case and orange or red in the second. The exact amount of the complement to be added must be estimated by observation and trial and error. There is no scientific method of exactly accomplishing this correction.
BLUES Prussian blue—A strong tinting blue, very dark with a greenish cast. Good for producing brilliant greens when combined with yellow. Cobalt blue—A strong blue with a reddish cast. Good for mixing. Cerulean blue—A strong blue with a greenish cast. Ultramarine—Sometimes called French blue. It has a reddish cast and makes a beautiful purple when mixed with alizarin crimson.
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