Thank you so much for your kindness reply

. I bought them at night so I couldn't see those problems until the next morning. I can't wait to repot them but they are blooming right now so I have to wait. The root systems like I said are horrible. They seem don't have green roots at all. All the roots are either too rotten or too dehydrated. The leaves seem rough so I thought they are dehydrated that why I watered so much on the leaves.
The yellow spots are in the second picture. They second and third leaf.
The back thing at the base, in some part I can wipe it off using a Q tip, but in some part, it is so hard to come off.
I just bought them so I don't know how the seller took care them before.
The whole systems are bad, but the flowers look very pretty. I don't know why.
I will try to clean them up using hydrogen peroxide when I repot them. Can't wait....
That are history of those two new orchids. The seedling orchids, I bought a few when I visited Malaysia. It is about a year now. I have been disturbed them a lot which I shouldn't. The thing is over here, they don't have orchid mix or anything specially about orchids. So when I got them, I took them off from the agar(each orchid had only about one to three leaves, and some were damage. The roots were tangled up and damaged as well) and placed them with a lot moss (don't' know what kind) and a few charcoal (this is the thing that I can find)...After a while, when I was sick, I asked someone to take care for me. He let them dehydrated so bad that when I got back. I was so hurry to water a lot, and I kept doing so until they showed sign of over watering (rotting leaves, roots)...so I re-potted them. This time I used only charcoal, and very little moss. After a while, they seem were not healthy. They grew so slow or no grow at all. I did fertilizer them using grow roots hormone about 4-6 times now over all. I heard charcoal are toxic, and actually it is true. Only two orchids out of five grew one tiny unhealthy root/each. The rest of roots were shrinking up. The leaves were dying out, and no leaves growth. So I repotted them again, this time i used bit of charcoal, a bit of moss, and a lot of tree fern. Let's see what is gonna come. One thing is don't buy seedling orchids, they are so hard to take care or survive. Two of them are already died. I still haven't found out perfect condition for them yet. They seem too dry if I put them up the rack and too wet if I place them down on the floor. agghr...they are just so hard to understand.