Sour or not

[brewstirrer]

Hi There, I have been brewing for a while and have never had a problem.

Just brewed a Coopers and I think it may have gone sour, having never experienced a sour beer can anyone tell me how I can check?

Any help at all would be appreciated.

Thanks.

 

[cheezydemon]

......sour taste? Some beers are meant to be sour, but if it is turning into vinegar, it will probably taste stronger and stronger.