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Benzimidazolone Orange HSL
As a historical note, Permanent Red Orange appears to have been temporarily discontinued from the original Williamsburg’s line. However, it seems this color is back in production. In its current form it is PO36.
In 2023, Golden published a vital series of tests on their colors and how they performed in mixes with various white paints. More information can be found at https://justpaint.org/astm-lightfastness-testing-for-oil-paints/.
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