Unknown material

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v50.15 · v0.47.05 This article is about the current version of DF. Note that some content may still need to be updated. More Info · V

Not to be confused with unknown substance.

Unknown material is a placeholder material that is not legitimately obtainable in-game. It appears as a light gray solid with no name, which is only referred to as "unknown material" in building descriptions. It has an internal material ID of -1 or [NONE], the same as used in tasks that require items of any or unspecified material.

Objects without a material can appear as the result of bugs. Doors and hatch covers in dark pits^Bug:6776 and dead civilizations^Bug:3478 are some examples.

Trivia

• Since the material ID of -1 is used as a placeholder value for any material, items made of the unknown material cannot be specifically requested as an ingredient, even in modded reactions.

See also

• Lava ([INORGANIC:NONE])
• Unknown tile

V · T · E Materials
More: Gems • Metals • Stones
Creature	Blood • Bone • Cartilage • Cheese • Chitin • Egg • Fat • Feather • Hair (Wool • Yarn) • Hoof • Horn • Ichor • Leather • Milk • Meat • Nail • Nervous tissue • Organs • Parchment • Pearl • Scale • Shell • Silk • Skin • Spit • Sweat • Tallow • Tears • Teeth • Wax
Plant	Fiber (Paper • Slurry) • Flower • Fruit • Leaf • Oil • Plant powders (Dye • Flour • Sugar) • Seed (Press cake) • Wood
Creature/Plant	Alcohol • Cloth/Thread • Extract (Golden salve • Gnomeblight • Honey • Royal jelly • Syrup • Venom) • Glob • Liquids • Soap
Inorganic	Metal • Milk of lime • Soil (Clay • Sand) • Stone (Ash glaze • Earthenware • Gem • Gypsum plaster • Porcelain • Quicklime • Stoneware • Tin glaze)
Hardcoded	Amber • Ash • Coral • Filth • Fuel • Glass • Grime • Ice • Lye • Magma • Mud • Pearlash • Potash • Salt • Unknown substance • Vomit • Water
See also: Material science