Benign: The forestry service uses mixtures of water and Ammonium phosphate along with a benign thickening agent and a coloring agent. The ammonium phosphate salt can have ecological impact especially in waterways, but is not toxic or cancer-causing for living animals. More info at https://www.fs.fed.us/rm/fire/wfcs/products/index.htm and https://www.fs.fed.us/rm/fire/wfcs/index.htm
Answered 12/15/2019
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