I have made a WA aura to identify a good potion when you enter HV scenario and have identified a colour of the bad potion. This is a forked code from someone else but I needed something with icons. This is a very easy process. Basically, one lists colours in the alphabetical order:
- (-) black
- blue
- (+) green
- purple
- red
then identify the bad potion and the good potion is always two colours down the list, like black and green. The list is a cycle so in case purple is the bad potion, black will be the good one. As a side note a bad potion removes up to 100 sanity while a good potion adds always 100 sanity.
First, under that pressure, I simply can’t remember the colours and I can’t count things when fighting with mobs and time is catching me 
I have just one problem. The other three effects are still undetermined. I can’t figure out the pattern and don’t want to use vessels just for that. The pattern could be similar to the one above which I assume at the moment.
Feel free to test it if you want. The aura is here:
https://wago.io/3qs600Clx
EDIT. Wowhead has the whole info on identification of the bad potion:
https://www.wowhead.com/guides/horrific-visions-strategy-faceless-mask-consumables-tips
https://classic.wowhead.com/news=311190/what-do-the-potions-do-in-horrific-visions-determining-the-bad-and-good-potions-