How to craft bombs

In the Witcher 2 the storage system do not belongs to Inn keepers but some other people. Like for your case in Flotsam, the storage is set to a man down-stair sitting inside a bar or walking around it. (just left turn when you enter the room with fighting area) And in Act 2, is the dwarf walking around or sitting in front of the whore camp's fire.

I've found four. Circle of Power, Life, Endurance, and Vigor.

Respectively, they seem to increase melee damage, Vitality, armor value, Vigor regeneration.

I'll see if I can't get some definite values hammered in as well.

Edit: Okay, preliminary testing has provided some results

Circle of Life -- 2 Vitality Regeneration (out of combat) / 1 Vitality Regeneration (in combat)

Circle of Endurance -- 3 Armor

Circle of Power -- 120% sign intensity? (So maybe +.2, since I had 1 sign intensity before?)

Circle of Vigor -- +300 duration (possibly x2 duration)