Yig said:Since you need to be a spellcaster to craft alchemical items are to effect of those items considered magic ?
Yig said:Could I use alchemical fire or acid to, for exemple, damage a Wraith ?
From SRD said:Special: A dwarf has a +2 racial bonus on Craft checks that are related to stone or metal, because dwarves are especially capable with stonework and metalwork.
A gnome has a +2 racial bonus on Craft (alchemy) checks because gnomes have sensitive noses.
You may voluntarily add +10 to the indicated DC to craft an item. This allows you to create the item more quickly (since you’ll be multiplying this higher DC by your Craft check result to determine progress). You must decide whether to increase the DC before you make each weekly or daily check.
To make an item using Craft (alchemy), you must have alchemical equipment and be a spellcaster.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.