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Dark Ashes are a byproduct of several industrial processes.

Production

Crafting

4 Small piles of Dark Ashes --> 1 Dark Ashes
9 Tiny piles of Dark Ashes --> 1 Dark Ashes


Bronze Blast Furnace

As a result of burning Coal, Charcoal or Coal Coke.

Industrial Centrifuge

2 Blaze Powder --> Dark Ashes + 1 Sulfur Dust
9 Dirty Piles of Dark Ashes --> 9 Dark Ashes + 1 Carbon Cell
16 Basalt Dust --> 4 Dark Ashes + 8 Flint Dust + 3 Calcite Dust + 1 Olivine Dust

Industrial Blast Furnace

Iron Ingot + 2 Coal Dust --> Steel Ingot + 2 Dark Ashes
Tungsten Ingot + Steel Ingot --> 2 Hot Tungstensteel Ingots + 4 Dark Ashes
Iron Ore + Calcite Dust --> 3 Iron Ingots + 2 Dark Ashes
Pyrite Ore + Calcite Dust --> 2 Iron Ingots + 2 Dark Ashes

Implosion Compressor

4 Ashes as a result of compressing a Coal Chunk or Iridium Alloy Ingot.
8 Ashes as a result of compressing Red or Yellow Garnet Dusts.
12 Ashes as a result of compressing Ruby, Sapphire, Green Sapphire, Emerald, or Olivine Dusts.
16 Ashes as a result of compressing Diamond Dust.


Uses

Crafting

1 Dark Ashes (In top left of crafting table) --> 9 Tiny piles of Dark Ashes
1 Dark Ashes (In the top middle of crafting table) --> 4 Small piles of Dark Ashes
1 Fertilizer + 1 Dark Ashes --> 2 Fertilizer

Industrial Centrifuge

Without Thermal Expansion - 2 Dark Ashes --> 2 Ashes (Functions like Forestry Ash)
With Thermal Expansion - 2 Dark Ashes --> 1 Ashes + 1 Slag

Industrial Electrolyzer

1 Dark Ashes + 2 Empty Cells --> 2 Carbon Cells