Grey (or Expert) to Pink

[Chyna9]

I have a ticker that had been delisted for a time, and only showed up as a non tradable cuspid number for probably about a year. I assumed it was completely dead. I have a few others like that.

Then one day it became grey and could trade again though I couldn't find any new info from company.

Awhile after that, it moved to expert, and still is.

I'm hopeful it goes pink someday but who knows. I'm finding it hard to understand the criteria for expert and what it actually means.

I'm some cases expert looks no different than grey and is a dead zone. In other cases it looks like it's a pit stop to becoming pink again.