Ashes

Ashes is a dust used to get Carbon Fiber Cell.

Crafting Table recipe:

Industrial Centrifuge recipe:
2xDark Ashes → 2xAshes

Ashes could be further processed in Industrial Electrolyzer.
2xAshes + Empty Cell → Carbon Fiber Cell

Besides that Ashes could be split into small piles using Crafting Table:

x4