US comrades and pickling enthusiasts, please avoid catching botulism and dying.

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Vinegar Warning: Pay Attention to Vinegar Labels for Pickling and Preserving

https://gardening.org/vinegar-warning-pay-attention-to-vinegar-labels-for-pickling-and-preserving/

If you've seen warnings about 4% vs. 5% vinegar for canning, heed them! Experts are sounding the call: Home canners MUST check vinegar labels for acidity.

Vinegar Warning: Pay Attention to Vinegar Labels for Pickling and Preserving

TL;DR: Vinegar is being sold at concentrations unsafe for preservation without proper warnings, 4% vinegar is unsafe while 5% is safe to can and pickle with.