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