Update: The folks at SPUR wrote back to me surprisingly fast! Apparently there were continued issues with the bottles and the defective products were still being sold until recently. They have a new bottle that looks similar but should be safe. They've requested pictures of my bottle for reference, which of course I will provide, and will send me replacement Part B solution!
Very happy with this outcome and customer service! If you haven't tried SPUR HRX, I highly suggest you do. It's a wonderful developer.
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