What is the reaction when beetroot extract is used as indicator with vinegar?

The colour of beet root extract is bluish red. Beet root extract show a sharp colour change from bluish red to yellow on reaction with strong alkaline thing hence it is suitable indicator to detect the alkaline thing. But on reaction with acidic substances the colour of the extract will slightly change towards the red.
Since vinegar is a weak acid it will show the red colour on reaction with beet root extract.