Added the Blacksmoke Furnace to Orc Fortress manual.

Previously this rather important workshop was not included in any of
the docs.

MasterworkDwarfFortress/orcfort_repository/workshops_core.html

@@ -82,6 +82,19 @@ <h1 align="center"><a name="orcb"><font size="5">Orcish</font><font size="5"> Ba
 
 <P>The Molten Pit can also be used to reforge ill-fitting salvaged armor and weapons from pitiful small enemies.   Re-forging allows you to very quickly convert small gear made from good materials into usable armor. Note, however, that the "cheap" recycled or factory pressed armor have some gaps and misfits, so they only provide 80% coverage. Be careful to use stockpiles to control which pieces the worker recycles, and be aware that if put on "repeat" he may wastefully rework the same item over and over.  Simply scrapping the items will provide a chance to recycle materials from the slag, but it will always be low grade metals.  If you want to melt a piece down to recover high quality material bars, you should use the normal smelter.
 
+<p><b>Blacksmoke Furnace:</b>
+
+The blacksmoke furnace is the is cornerstone of orcish heavy industry. It allows the extraction of oil from oilbearing stones, or the conversion of four bars of coke into oil. Acid can be distilled from flux, a vial, and a boulder of either brimstone, saltpeter, or rock salt. Be warned that acid is so corrosive it will render the vial unusuable after the vial of acid has been used in a reaction.
+</p><p>
+Acid allows for the removal of rust from iron or steel, and oil is used in the processing of rare minerals such as aluminum, chromium, cobalt, and titanium.
+</p><p>
+Batches of fire and acid arrows can be crafted with wood, iron and oil/acid respectively. Foreign-made cannons can be upgraded to flamethrowers, and oil and mechanisms can be combined in a box to create detonator or stickbomb satchels, which the bravest of warriors can carry instead of a shield.
+</p><p>
+Finally, acid and oil can be combined to form synthsilk. While not as valuable as the rare silks found in nature, it's perfectly serviceable for use in threads and cloth.
+</p><p>
+All reactions at the blacksmoke furnace require fuel.
+</p>
+
 <p>
 <img border="0" src="screenshots/damasc_forge.png" align="left" width="84" height="86"><img border="0" src="screenshots/magma_damasc.png" align="left" width="84" height="86"><b>Orcish Damascene Workshop:</b>   A warlord and his chosen war-orcs might get their weapons at a Orcish Damascene Shop, where an artesian uses ancient methods to fold exquisite blades from rare metals.  Unfortunately, the orcish 
 damasc worker needs foreign tools salvaged from human or dwarven loot to make 
@@ -160,4 +173,4 @@ <h1 align="center"><a name="orcb"><font size="5">Orcish</font><font size="5"> Ba
 <div align="center"><a href="home.html"><img src="l_orc.JPG" alt="" width="110" height="151" /></a></div>
 
 </body>
-</html>
+</html>