Thanks - I checked! It says “Jello - no red” but “fruit juices - no pulp” without a color rule. Maybe the problem is the artificial color.
A quick Google supports this, mentions cranberry juice is okay! Good thing, or I’d have had to make simple syrup to keep the from having a hypoglycemic collapse.
Good, I’m glad to hear that - and will remember for future reference, I love cranberry juice.