** The DM must mislead the possessor of the potion so as to convince him that it is not harmful.
    (See item description , below, for particulars.)

This potion affects the mind of the character so that it believes the liquid is some other potion
(healing, for example, is a goodchoice -- damage is "restored" by drinking it, and only death
or rest after an adventure will reveal that the potion only caused the imbiber to believe that he or she was aided).

If several individuals taste this
still 90% probable that they will all agree it is the same potion
(or whatever type the DM announces or hints at).

<fuming, opaline, tawny, taste: sweet>