Wikipedia asserts an industry standard element-color scheme citing handbooks; Entertainment Partners documents strip colors as user-assigned by scene-header values with no defaults on the page read. No non-commercial primary source was found. Evidence needed: a production-handbook chapter, union or school guide stating the convention, or the default strip-color table in the scheduling product's Strip Designer or Release Notes.
Why this is still open: Commercial blog posts disagree per search summaries, and the vendor manual pages read do not list defaults.