[Food Safety] Is this kombu still safe to eat? White spots and some yellow-green areas

Can this kombu still be eaten? I’ve seen many posts showing similar white spots that people say are normal (salt or amino acid crystals). But I’m a bit worried about the slightly yellowish and greenish spots.

For context: I live in Pasto, Colombia, where the humidity is quite high. This package has been open for over a year now.

I’d really appreciate any advice or insight — I’m not sure if it’s still safe to use or if I should just throw it away.

(Photo attached)