Stomach acid is mostly HCl, much stronger acid and more concentrated than vinegar's acetic , and at pH of 4.5-6.o, coffee is also on the weak side--though I've read it can contain a medly of thirty different acids! I'm glad my morning Java is safe enough
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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