Back in the 80's grape was the color of choice. God I miss those days!!
Aww man Zoom had the Utale in black grape that I got hooked on a couple years ago and the ^&$#^$&$^ stopped making it! That color was the only one that consistently produced (well) for me with a carolina rig. All the other purplish colors do squat. They have Black grape again but it's only for the small trick worms. Helps with Shakey heads but I caught some big fish with that skinny [censored] utale....
Watermelon/red fleck 4 inch BPS Stick O worms and big Zoom Watermelon/red trick worms are my 2 go-to's for texas rig. Blue with blue fleck Stick o's for muddy water.