[quote:6a62f6a1ba="habib"][quote:6a62f6a1ba="XENONSION"]that fatty little blob of crap will redisperse into your spice, and is probably causing your discoloration issues.  It needs to be filtered out..otherwise you are just working in circles here.     chemical filter papers would be ideal, but  coffee filter material can also be used.[/quote:6a62f6a1ba]      ok then perhaps he can cut a small piece of coffee filter to filter through so that it doesnt soak up all  the heptane[/quote:6a62f6a1ba]  Yes, you aren't working with a large amount of material here, so size it down appropriately.  squeeze it all through, a tiny amount of solvent will saturate your filter, but that's negligible.  One should expect SOME loss of material during these processes anyway.