Purple potion = 20 health points, just sell them
ALCHEMY SPOILER THREAD - this is an old topic; for broken links, change "lariancom.siteprotect.net" to "larian.com", or remove "via.t-online." from "www.kiya1.via.t-online.de" for the URLs to work.
The spider statuette can be used to chase merchants out of their shops without a reputation drop, so you can loot them. This does not help with Kistandalius in Ars magicana, though.
You do not get the quest that opens the second level of the mine until after going to the castle (which you do not need to rush).
