If if it is red Litmus paper, then it will remain red because vinegar is acidic. (Blue Litmus paper would turn red if you dipped it into vinegar).
it can turn red pH paper blue and blue pH paper red
HCl (hydrochloric acid) is an acid so it will turn litmus paper red. and alkali will go from red litmus to blue.
Litmus paper turns red if the solution is acidic and blue if the solution is basic. Vinegar is an acidic solution (due to acetic acid), and will turn the litmus paper red.
it turns blue litmus paper red
It remains red. Red litmus paper can only be used to test basicity, in which case it'll turn blue.
Blue litmus paper turns red in vinegar solution because vinegar is acidic and pH below 7. The acidic solution causes the blue litmus paper to undergo a color change and turn red.
The litmus paper would stay red. That means vinegar is an acid.
Because Vinegar is an acid, the litmus paper would turn red
It remains red. Red litmus paper can only be used to test basicity, in which case it'll turn blue.
pH paper will turn red when put in vinegar, indicating that vinegar is acidic.
Acid turns it in red, while base will turn it blue.
The answer isn't so simple. There are various kinds of pH paper. However, I presume you are referring to litmus paper which is the widest distributed form. Acetic acid has no effeect on red litmus paper but turns blue litmus red