Im at work right now but the other day i rinsed my roots to get the dark color out, they were all shiney and white sunday, yesterday afternoon the dark spots were back. Im completely convinced that this coloring is from the MICRO in the advanced nutrient 3 part. It rinses right out when i rinse the roots. I see not root damage, jist the coloring. Im thinking this could cause an issue later on though because if the coloring from the nutes is trapped in the root ball then some nutes have to be there also. Could cause nute spikes, possibly, jist gonna have to watch it