Rootone Expiration

Hanford, CA(Zone 8a)

Does Rootone go bad? I have seen several "yeses" that say it goes bad after exposure to air. Then I have seen info that gardeners have used one bottle for years (one was since August of 1978!). Could an expert weigh in here and give me guidance. I have a bottle probably about 4 years old, stored closed but I have not been careful about keeping it sterile. Stored in hot greenhouse.

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