Blue ochre can form naturally, however it is fairy rare. Blue Ochre tends to be a dark blue color but it can also be greenish. It is said that light can catalyze the blue color. It is usually fairly lightfast, but has also been known to discolor over time, perhaps due to exposure to air. Blue Ocher is seldom available commercially. Vivianite is the name of the mineral.
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Historical Color
Blue Ocher
Alternate Names
Blue Iron Earth
Vivianite
Hydrated Iron Phosphate
Pigment Description
Stats
Lightfastness
Variable
May not be totally lightfast or stable. Possible to turn yellow under some conditions. See discussions of conservationists and third party sources for more details.
Toxicity
Thought to be in the category of Lower Concern
Treat all pigments and paints with studio safety protocols.
Particle Size
Varies
Chemical Name
Ferrous phosphate
Fe₃(PO₄)₂.₈H₂O
Dry Pigments listing Blue Ocher
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