Editing 40d:Magma-safe

{{quality|Exceptional|08:12, 29 May 2012 (UTC)}}{{av}}
[[Magma-safe]] materials consist of [[pig iron]], [[iron]], [[steel]], [[nickel]], [[nickel silver]], [[platinum]], [[bauxite]], ([[raw adamantine|raw]]) [[adamantine]], and [[fire imp]] [[bone]]s & [[leather]]. It can be difficult to control [[magma]] flow with [[floodgate]]s since [[mechanism]]s must be made out of [[rock]]s, almost none of which are magma-safe ([[bauxite]] and [[raw adamantine]] being the sole exceptions).

Strictly speaking, only a material which is solid and stable at the temperature {{ct|12000}} (i.e. MELTING_POINT/BOILING_POINT/IGNITE_POINT/HEATDAM_POINT greater than 12000 and COLDDAM_POINT less than 12000) is supposed to be considered magma-safe.

Note that although the above metals are all magma-safe, their [[ore]]s (excluding raw adamantine) are '''not''' - thus, while a [[platinum]] floodgate will operate properly in magma, [[native platinum]] mechanisms will melt after several seconds.

In order to construct mechanisms from bauxite, simply ensure that they are the closest available stone to your [[mechanic]], ideally by placing a bauxite-only [[stockpile]] around your [[mechanic's workshop]]. To use raw adamantine, however, you must allow its use for non-economic purposes in the stock screen ({{k|z}} and select 'stone') - while doing this, you might want to suspend any other stone-using jobs.

When linking a trigger to an object, the ''first'' mechanism selected is attached to the object, and the ''second'' is attached to the trigger. Unless the trigger itself will be submerged in magma (as could be the case with a [[pressure plate]]), only the first mechanism (attached to the object that will be submerged) need be made of bauxite. If you do not have any bauxite or adamantine available, you can also work around floodgate based flow control by using [[screw pump]]s to pump the magma over [[wall]]-barriers, or using water to form [[obsidian]] to plug flows and channel through them to reopen them (necessity and invention and all that).

Constructions that resist magma are:
* Constructions ([[Wall]], [[Floor]], [[Ramp]], and [[Stairs]]) of any material can never melt or burn - there is nothing wrong with a [[wood]]en magma reservoir.  Natural (but not constructed) [[ice]] walls/floors/ramps/stairs may melt however.
* [[Fortification]]s will allow the passage of [[magma]], but once the level rises to 7/7 they will ''also'' allow the passage of large creatures. Additionally, '''flowing''' magma can potentially push large creatures through non-filled fortifications, as well as vertical bars and wall grates. [[Pump]]s are a positive defense, but can change the dynamics of fluid [[pressure]].
* If not submerged (that is, not opened to let magma flow over/past/around them), [[door]]s, [[floodgate]]s, and raised [[bridge]]s (provided that there is no magma on the space the bridge would occupy when lowered) of non-magma-safe stone or metal are safe. So long as they are just in contact with magma, only acting as a passive "wall", they are fine. If opened, they will melt.
* Raised Drawbridges are one exception, if their "shadow" tiles (those that would be covered by it if it was lowered) get covered in magma it '''will''' melt (as of 20d16)
* All parts of a [[pump]], except for the passable tile, provided that none of the components are made of wood.

==Glass==
[[Glass]] behaves oddly in regards to magma. Glass is technically magma safe, based on its melting point of {{ct|13600}} (the same as that of bauxite); however, while glass items used in buildings will survive indefinitely while submerged in magma, glass items ''dropped'' into magma will instantly vanish. Glass [[statue]]s, [[screw pump]]s, and [[floodgate]]s are all fine when submerged in magma. The results of experiments with glass and magma were [http://www.bay12games.com/forum/index.php?topic=27423.msg333562#msg333562 posted on the forums].

Glass barriers still require magma-proof mechanisms to operate without deconstructing.

==Game calculations==
In the game, magma's temperature is exactly {{ct|12000}}.
{| class="wikitable sortable"
! Type !! Material !! [[Temperature scale|Melting Point]]
|-
| Metal || [[Pig iron]] || {{ct|12106}}
|-
| Metal || [[Nickel]] || {{ct|12619}}
|-
| Metal || [[Nickel silver]] || {{ct|12619}}
|-
| Metal || [[Steel]] || {{ct|12718}}
|-
| Metal || [[Iron]] || {{ct|12768}}
|-
| Metal || [[Platinum]] || {{ct|13182}}
|-
| Metal || [[Adamantine]] || {{ct|25000}}
|-
| Stone || [[Bauxite]] || {{ct|13600}}
|-
| Stone || [[Raw adamantine]] || {{ct|25000}}
|-
| Leather || [[Fire imp]] [[leather]] || {{ct|13500}}
|-
| Bones || [[Fire imp]] [[bone]]s || {{ct|13500}}
|-
| Glass || Green [[glass]] || {{ct|13600}}
|-
| Glass || Clear [[glass]] || {{ct|13600}}
|-
| Glass || Crystal [[glass]] || {{ct|13600}}
|-
| Ash || [[Ash]] || none
|-
| Ash || [[Potash]] || none
|-
| Ash || [[Pearlash]] || none
|}

==Bugs==
All magma-safety checks are broken in this version, repeatedly checking the IGNITE_POINT 5 times instead of checking each individual temperature ({{bug|4573}}). In practice, this only affects the ability to select building components for various workshops and furnaces that are powered by magma.

The following patch for version 0.28.184.40d for Windows fixes both [[fire-safe]]ty and magma-safety checks:
{{spoil small|<nowiki>0x50549A : 62 DF -> 42 E0
0x5054A4 : C7 -> CF
0x5054A6 : 56 DF FD FF -> 8C 00 00 00
0x5054C2 : 3A DF -> 9A DD
0x5054D2 : 2A DF -> 7A DE
0x505536 = B8 10 F8 56 01 E9 50 E1 FD FF</nowiki>|Binary Patch Enclosed}}

{{Magma FAQ}}
{{Category|Physics}}
{{Category|Magma safe materials}}