Albedo is an additional, or secondary substance which is present in some alchemical ingredients in addition to the primary substance. All alchemical ingredients contain one of six basic substances: aether, hydragenum, quebrith, rebis, vermilion and vitriol. There are also three additional substances: albedo, nigredo and rubedo. Any given ingredient may contain only a single basic substance and potentially one additional, or secondary substance.
Albedo potions: If all ingredients used to create a given potion contain albedo as an additional substance, the potion created reduces the toxicity of any subsequently imbibed potions for 1 hour, which is not the entire duration of most potion effects, but very helpful with Blizzard.