From Dwarf Fortress Wiki
The Ashery is a workshop used to make lye, as well as making potash from ash or lye. To build an ashery, you need a block, a barrel, a bucket, and someone with the potash making or lye making labor enabled.
 See also
|Workshops & Furnaces|
|Workshops||Ashery - Bowyer - Butcher - Carpenter - Clothier - Craftsdwarf - Dyer - Farmer - Fishery - Jeweler - Kitchen - Leather - Loom - Magma forge - Mason - Mechanic - Metalsmith's forge - Millstone - Quern - Screw press - Siege - Still - Soap - Tanner|
|Furnaces||Glass furnace - Kiln - Magma glass furnace - Magma kiln - Magma smelter - Smelter - Wood furnace|
|Related Articles||Clutter - Kennel - Shop - Trade depot|