This is happens when you mix pool chemicals

Watch at 20 seconds when the top suddenly turns yellow.

That's nitrogen trichloride being produced from dichlor or trichlor being mixed with calcium hypochlorite.

It was a big mistake for the lady to put her face directly over the bucket when it began to react.

She just barely missed getting seriously injured.

Even the dog realized that it was better to run because the dog suddenly took off.

 
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