Oil is dark brown, almost backish, what does it mean?

[Weezard]

Bought some oil. Not told of the name of they variety used, or how processed. Well, this is what happens,
when desperately seeking a cure.

Quite clueless here. If the oil turns out dark brown, what does this mean?

It depends.
If an alcohol extraction, it means there was still some water in the starting material, or in the solvent.
A very dark brown can mean that the oil was scorched a little when decarbing.
A dark brown that smears to yellow, or amber, usually indicates good quality.

Also, in terms of producing low THC, does it depend on much gas is used?

Sorry, I'm too medicated to decipher that.
Try re-phrasing.

Is it possible to produce a oil that takes out most of the THC and leaves higher
CBD?

Many thanks,

Um, yes.
Start with a high CBD strain.

As for separation of the two from existing oil?
Theoretically, one could do a fractional distillation.
But pragmatically, that is beyond this humble cookers abilities.

Your best bet for a real answer?
Hunt down Graywolf and ask him.
Just google Graywolf or Skunkpharm.

Aloha,
Weezard