Windex and Red wine

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](https://i.stack.imgur.com/fmPun.jpg)](https://i.stack.imgur.com/fmPun.jpg)


[![After](https://i.stack.imgur.com/u5TFa.jpg)](https://i.stack.imgur.com/u5TFa.jpg)


