| http://www.w3.org/ns/prov#value | - r heat stability, the only mention of polycyclic pigments other than diazo pigments being by way of contrast, since the azo pigments have the further disadvantage of bleeding and/or blooming owing to the fact that they are somewhat soluble in plastics and other solvent containing systems (page 37, middle column, last sentence to right column, last complete sentence).
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