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Hello! Welcome to the forum!
Healthy roots can be any color--they can be green, white, gray, or even brown. However, gray or brown roots are more likely to be dead. To confirm, give the root a gentle squeeze. If it feels hollow, soft, or squishy, then it's dead. You can cut off the dead roots if you're sure.
Pictures can help when it comes to id'ing leaf symptoms. Brown leaves could be due to a fungal/bacterial rot, though it's also possible for dens to shed old leaves periodically.
Also, check the bark. If it feels crumbly and soft, then you really need to repot the plant, because old, stale mix is detrimental to the roots.
Good luck!
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Orchids...  |