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    Isoindolol Orange

    PO61

    Alternate Names

    Isoindoline Orange

    Chromophal Orange

    Tetracholoroisoindolinone Orange

    Pigment Description

    Isoindolol Orange, also known as Irgazin® Orange L. This color has moderate to excellent lightfastness depending on the pigment supplier, so one may wish to do one's own lightfastness testing. It's offered by one paintmaker in oil and acrylic, and turns up in a few blends in watercolor.

    Resources

    PO61 pigment data from David G. Myers, The Color of Art Pigment Database, Artiscreation.com

    General information about this class of pigments from Handprint,

    Stats

    Lightfastness

    Varies depending on manufacturer, may be Very Good

    Not rated by the ASTM but likely somewhere between I and II. Some varieties show blue wool ratings that could be said to be closer to excellent (BWS 8) with a slight drop off (BWS 7) in tints, while other pigment suppliers have scores that fall closer to moderately poor lightfastness (BWS 5). The 1980s era NPIRI reports good performance in masstone with slight fading in tints for outdoor Florida lightfastness testing.

    Transparency

    Transparent, Semi-Opaque

    Toxicity

    Lower Concern

    Treat all pigments and paints with studio safety protocols.

    Dry Time

    Slow

    Chemical Name

    Tetrachloro-isoindolinone

    with PO61 (Isoindolol Orange)
    No single-pigment Oil found with PO61

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