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The crucible is used for smelting Ores, to catch liquid Pig Iron that is smelted in a Blast Furnace, and as a device for mixing Alloys. It can also be picked up with a pickaxe, and moved around while retaining its contents. The maximum capacity of the crucible is 30 ingots worth of metal (3,000 units). The crucible will refuse to melt an item that would cause an overflow.
Making the Crucible
Right-click a stack of 5 or more Fire Clay to open the interface and make the following pattern:
Using the Crucible
On the Forge
In order to heat a Crucible, it must be placed on a lit forge. Place it by shift-right clicking on top of the forge block. There will still be a small area around the bottom of the crucible where you can access the forge to add more fuel. Crucibles do not block the airflow of a Bellows.
Place the ore you wish to smelt in the Input Slot(1). Once the crucible is hot enough, the ore will melt and the Status Box(5) will display the resulting metal. The Volume Gauge(4) will also increase. Note: Ingots, Unshaped Metal, Anvils, Sheets, Double Sheets, Wrought Iron Knife Blades, and unfinished armor can also be melted in this way.
Place a Ceramic Mold in the Output Slot(2) to retrieve your liquid metal.
A combination of metals can be put into the crucible to make alloys. Note: Liquid Unshaped Metals pour slowly into the crucible instead of all at once, for more precise mixing of alloys. As items are melted, the Volume Gauge(4) will increase, and the Status Box(5) will change to display the current percentages, and the name of the alloy when the percentages are within the needed range. Once the name of the desired alloy appears, it can be removed by placing a Ceramic Mold in the Output Slot(2).
An example of mixing Bronze:
An Unknown combination of metals will result in Unknown Metal being displayed at the top, and if poured into a ceramic mold, will make a useless unknown ingot.
With the Blast Furnace
Two crucibles are needed to create a working Blast Furnace. One is used in the crafting of the Blast Furnace block, and the second is placed underneath the Blast Furnace block to catch the smelted Pig Iron.