Hi titto and welcome <img src="/ubbthreads/images/graemlins/wave.gif" alt="" />
This is a real good link to answer all of your potion questions.
Divine Divinity Alchemy/Potions Here's a pdf zipped version you can download here:
DD_Potion_Alchemy_Guide Kyra_Ny <img src="/ubbthreads/images/graemlins/delight.gif" alt="" />