Does not seem safe. I didn't use it very often because I didn't need it. When it came out of the box I noticed that it was a little crumbly(?) like it was made of the thinnest material and when I was only using it for testing in clear water some small pieces continued to crumble with bubbles. I don't think this product is very safe for anything and I would recommend using a different product (maybe a different brand?). I generously gave two stars because the blisters seemed permanent.
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