Black-tipped Roots on Phal. Brother's Golden Fortune Keiki

[Phal-lover]

Hello all, I'm very happy to announce that four days ago the first keiki any of my orchids has produced has been cut and potted in a slatted hanging basket. Up until now, it has been in great shape. I was going to leave it on the mother until it bloomed (I just think that looks gorgeous) but the mother has recently developed scale and I don't want to risk baby. Therefore I cut it at a later date than it could have been cut, it already had about nine healthy roots and three large leaves. Because of the scale I couldn't pot it with mama, but now I noticed that three of the roots (the only three coming out of the basket) are tipped with black. I looked it up and found that it could be poisoning from hard metals or something, but want a second opinion. My best guess, if this is true, that the roots rubbed the zinc coated wires the basket hangs from when I potted it. Should I cut off the tip or sterilize them with peroxide or other?

Sorry for the bad-quality pics. My camera died before I could get better ones.