[Blueflag]

um ... vinegar is acetic acid solution. I doubt it is alkaline.

[MrDem]

True but I know the litmus paper reading is not the same as the biological effect once down the hatch. Orange juice is a good example. Acidic but has an alkaline effect once inside.

[mountn man]

Apple cider vinegar is an exception: unlike almost every other vinegar, it has an alkaline ash and improves pH by making the body less acidic.