Cast a spell that makes a very thin sheet of metal that reacts to air by burning and releasing light. Anyone with a good amount of ranks in alchemy should know about at least a couple, pick one that will do it. Here is the spell Always have it memorized, it is just too good for too many things. Along with fabricate.
Wind walls, walls of fire, wall of iron all work very well also.
SRD:
Major Creation
Conjuration (Creation)
Level: Sor/Wiz 5
Casting Time: 10 minutes
Range: Close (25 ft. + 5 ft./2 levels)
Duration: See text
This spell functions like minor creation, except that you can also create an object of mineral nature: stone, crystal, metal, or the like. The duration of the created item varies with its relative hardness and rarity, as indicated on the following table.
Hardness and Rarity Examples Duration
Vegetable matter 2 hr./level
Stone, crystal, base metals 1 hr./level
Precious metals 20 min./level
Gems 10 min./level
Rare metal1 1 round/level
1 Includes adamantine, alchemical silver, and mithral. You can’t use major creation to create a cold iron item.
Wind walls, walls of fire, wall of iron all work very well also.
SRD:
Major Creation
Conjuration (Creation)
Level: Sor/Wiz 5
Casting Time: 10 minutes
Range: Close (25 ft. + 5 ft./2 levels)
Duration: See text
This spell functions like minor creation, except that you can also create an object of mineral nature: stone, crystal, metal, or the like. The duration of the created item varies with its relative hardness and rarity, as indicated on the following table.
Hardness and Rarity Examples Duration
Vegetable matter 2 hr./level
Stone, crystal, base metals 1 hr./level
Precious metals 20 min./level
Gems 10 min./level
Rare metal1 1 round/level
1 Includes adamantine, alchemical silver, and mithral. You can’t use major creation to create a cold iron item.