Can I haunt people as a ghost?

I have 2 extra philter of the phantom potions from a quest that make me appear spectral for 30 seconds. Are there any practical uses for this? Can I use it to scare other people for some benefit or use it to walk by undead safely?

Also, is it possible to make more?

Solution 1:

The potion seems to be a cosmetic and nothing more. I have yet not discovered any use for it, other than making you look fancy.

Regarding your question if making more is possible; No, or as far as I have explored the alchemy possibilities, I haven't found an option to do so. The only way to obtain some are by killing Wyndelius in the Shroud Hearth Barrow.

Solution 2:

Any crimes you commit while in Spectral form will not go towards your bounty, so you can break the law without punishment.