I pretty much do as many freeze/thaws as i need to get a clean tea, usually say 3 to 5 freezes, just depends on how gunky the teas are, but i brew in bulk so usually 100 grams of Mimosa or Acacia. Ime even after freezing/thawing/filtering a few good times there can still be stuff crashing out or tannins slipping through the filter, so what i usually do is freeze/thaw/filter a few good times, then on the last freeze/thaw i'll suck up the clean tea with a syringe to get it away from any remaining sediment, then i'll add some more water to the sediment and stir and re-freeze/thaw the sediment-containing water then i'll suck it up and re-do that a few more times until i'm confident i've gotten any DMT that may have gotten stuck in the crud, then i combine all the clean liquids and reduce down to final concentration, and the resulting tea tastes pretty much like water, i'll pour off a dose and dilute it with some extra water for a cup of tea, warm it up, add some sweetness (though that's optional) and then drink it, and it's very palatable surprisingly. As for the color, i wouldn't worry about that too much, ime the color can be clearer or it can be dark, doesn't really seem to say much about potency or what not ime.