Wizard brewed Potions produce Planar Tainted Poitions

[MAGIC]

I think it would be interesting if potions brewed by wizards produced the planar tainted (I can't recall the exact terminology) version of potions. It would fit in with the idea that being around a wizard when he casts spells gives you planar sickness. People could make the tradeoff between dealing with a wizard who can produce every type of potion but it would advance your planar sickness -- or finding a sorcerer who can only produce a limited selection of potions, but they won't have planar taint.