Yellowish white is no big deal. That just means that those roots didn't get a lot of sunlight. Orchid roots need sunlight to be green.
I wouldn't soak the roots in fungicide. As long as you gave the plant a good rinse and cut the root back into healthy tissue, you should be okay.
As far as the black spots, get a couple more posts under your belt. The forum requires that you have I think 5 posts, before you can post pictures. Pictures will be the best way for us to tell you what we think is going on.
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