Synthetic Iron Oxide Hydroxide Brown
PBr6
Alternate Names
Mars Brown
Brown Iron Oxide
Synthetic Brown Iron Oxide
Pigment Description
One of the synthetic brown oxide pigment codes, Iron Oxide Hydroxide Brown. Whereas many paints are labeled PBr7 (think natural brown earth) we've heard of PBr6 described as sort of like a synthetic version of that. PBr6 is a synthetic iron oxide brown that is associated with reclaimed mill sludge. Like PBr7 it comes in a variety of different brown colors.
Michael Harding Burnt Umber, made with PBr6
Refer to the Artist's Guide to Health and Safety for information about the hazards. It does contain Iron and possibly also manganese, as well as the potential for impurities, which is one of our concerns. The author's updated work can be found through her site. Artiscreation has a few notes as well such as not to breathe the dust and not to ingest (which is true for all artist pigments).
Michael Harding Raw Umber, made with PBr6
Resources
PBr6 pigment data from David G. Myers, The Color of Art Pigment Database, Artiscreation.com
Information about PBr6 from Bruce MacEvoy, Handprint Guide to Watercolors,
Stats
Lightfastness
Excellent
Considered ASTM I, excellent.
Transparency
Opaque
Toxicity
Previously thought to be in the category of lesser concern, however may contain impurities
Rossol mentions that different natural or synthetic oxides may be found with this pigment code. She writes, “may contain manganese or other toxic impurities.”
Chemical Name
Brown magnetite iron oxide
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