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The other day I was cleaning my counter tops with windex. There was a couple red wine (cabernet sauvignon if it makes a difference) stains from the night before and the stains turned an gray/blue color upon being sprayed with the windex. What is the cause of the color change? Is it simply the blue windex mixing with the red wine?

Before

After

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    $\begingroup$ Arguably, most organic colors are pH indicators. $\endgroup$ – Ivan Neretin Oct 22 '17 at 7:21
  • $\begingroup$ Red cabbage soup goes through similar color changes (though I'm not sure if it is best served with meat or with fish). $\endgroup$ – DrMoishe Pippik Oct 23 '17 at 22:26

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