Making Skull Dead Rock

Very artistic.

I'd be concerned what may leech into the water from your cement mix.
I'm guessing the white powder was portland cement?? The cement is ok other than it will initially spike pH, but I don't know what the yellowy colored stuff you used in the mix is ?

Curious about the mix in other words.
 
Portland white cement or Portland 1 or hydraulic water stop
Sand or crushed oyster shell
Water


Option 2

Pond foam uv resistant
Table salt to shape.
 
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