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d8WV8 TIL that 70% isopropyl alcohol is more effective at killing bacteria than 91% alcohol. This is because the water in the solution helps it permeate more fully.
wL8n6 TIL that 70% alcohol is better at disinfecting surfaces than 91% alcohol. In one experiment, a 50% alcohol solution killed Staphylococcus Aureus in less than 10 seconds, but a 90% solution failed to kill it even after two hours of contact time.
1agEX TIL 70% isopropyl alcohol is a more effective disinfectant than 99% concentrated