Datr... that is a LOT of sodium hydroxide and it isn't necessary to use so much. The colouration of extracts usually comes down to plant fats and oils that the naptha pulls from the material as well as the dmt.. it doesn't matter at all really, in fact the coating they create on the crystals also makes them more forgiving to slightly higher temperatures, which can be a good thing when vaporising. Some find the coloured extracts to be more organic feeling and less alien.. a little more of earth. This is fairly speculative but I can say myself I do enjoy coloured extracts the most. I'd leave it personally, but if you'd rather pure white crystals you can recrystalise in some solvent.. maybe even do a sodium carb wash on the solvent too in case any lye made it over
hope that helps