Right! I'm sorry, I sort of skimmed over the rules. I will go and read them thoroughly now.
But no, I have not learned about this in class or done any labs on this.
However, I suppose what you would want to do is put both samples into other vials (each with their own vials) into a spectrophotometer and see the concentration of the anthocyanin via the pH differential method (which is what I just stated, I believe).