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I can't comment from a chemists point of view and am not advocating its use (or disuse), but I can confirm that ever since I was a small kid (growing up in South Africa), we washed Iceburg lettuce with this on a very regular basis (daily to weekly), and no one ever suffered any ill effects attributable to Potassium Permanganate. I still do this for washing Iceburg lettuce 25 years later.

How I was taught to do it -

Get a large bowl - one you could half fill, and add an iceburg lettuce to. I have only ever used stainless steel or glass bowls to do this. This is probably important.

Disolve a tiny amount of PP in water - something in the region of 2 tiny crystals, crushed between 2 spoons so it is a finer powder and disolves in water quickly. The final colour should be a light magenta/purple. To confirm the amount used is tiny - a 5cm high, 1cm bottle is probably 10 lifetimes supply.

Be carefull not to drop the crystals, as they can die the skin, and most things they come into contact with.

Chop the lettuce, add to the mixture and stirr / wash for a few minutes. I suspect you should use a spoon, but I use my hands.

Drain the solution and wash the lettuce in plain water. I wash the lettuce 3 times in plain water, then put the lettuce in a sieve and run more water through.

Hope this helps.

DG.

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16y ago

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