Mr. Texas I believe your south Texas location is to warm for the fruit to turn red.
Blood oranges turn red here. Some years more than others. Smith blood and
bream tarocco were very red this year. In warm years they just get streaks of red. They don't ever turn purple like they do in California.
Here in the Houston area, I am not in what Texans call "South" Texas.
That would be the Valley around Brownsville. We are sometimes called SE Texas.
The raspberry tangors would be red if they had another month of hang time.
Believe it or not blood oranges will redden up if left in the refrigerator!
The Houston area is the perfect place to grow satsuma as it requires some cold weather for best quality. Satsuma
doesn't do very good in South Texas.