Thank you all. Tried again with a ph of 4 and added .5% alcohol and 1% citric acid in addition to the Optiphen Plus. Within less than 24 hours Mask looked like this. Is it possible this reaction is something other than fungi?
Thanks for your help! Ah I thought it could go up to a PH 6. Just started using Optiphen plus, so I see that’s where I made the mistake. Going to add a bit of citric acid. And yes, clay is sterilized.