The last two residential services I did here in coastal Southern CA. were overhead 100A.
And the only U/V protected/sunlight resistant stuff was Black TWHN. The other colors did not have the Listing. So, as Zapped said,
use Black, and white tape the neutral.
We upgraded my grandfather's house in 1991, black THWN, and it's still OK. (Again, coastal CA. - lots of 75° sunshine, little rain.)
