What you COULD expect what could possibly be undesired is that if you re-x and also add a REALLY impure product, then the whole outcome product will also suffer from this.
Meaning like let's say you remove 80 % of other stuff, then your nearly white products should be very white.
But if you have a mixture, you would still get pretty orange stuff if you combine ALL of them.
Why not just do 2 instead of 1.
One with the best 50 % purity samples and one with the 50 % worst purity.
I always try to leave the whitest one on their own and don't spoil them with other crap = )
If you dont care, then just make 1 big pot and re-x ;P