With my first extraction, STB from Mimosa 100g, I yielded about 330mg yellow and white spice. Not really much because i accidently spilled my first pull all over the kitchen counter. I want white spice, so i'm busy recrystallizing now. Put the 330mg in a glass, with 10ml of Naphta. Put it in a hot bath and nearly all the spice dissolved in the nafta. Just a little bit is left floating in the Nafta. The Naphta is colourless originally, but when I dissolved the spice it turned yellowish, same colour it was when I did the pulls. The problem is: there is no impurity floating on the bottom. Only a little bit of powder, but really just a few grains. What could be the cause?
Edit: And do i have to be cautious about not letting to much Naphta evaporate when trying to dissolve all the spice?

And now some really tiny crystals are starting to form because of evaporating the solvent a bit. Can someone please help me out? Would hate to waste the spice.. Yellow spice should leave impurities right?

some of the oils, or yellow impurities from the bark are more easily dissolved in naphtha at room temperature at least. and it depends on the solvent you use to some extent.

try to play with the temperature of your solvent before re-x ing your impure spice next time. try to cool the solvent in the fridge or in an ice bath for some time, then dissolve the spice.

I use coleman fuel. I let cool down the solvent, covered with tinfoil, and as it was starting to cool down, crystals were starting to form. So room temperature and below won't hold the spice. Now i poked a hole in the tinfoil and letting the solvent evaporate, so i will get crystals. I guess although the spice was slightly coloured, it didn't contain impurities? This is something dmt nexus wiki page says:
'(Optional) Recrystallize from Hot Solvent:
This will help to reduce impurities and give the product a more sharply defined melting point, but it won’t do much to reduce discoloration unless combined with activated charcoal'.

So just discolorated maybe?

Edit: Some activated charcoal did the trick.