Hypertufa, a lighter concrete mixed with perilite that can be carved when green, and is lighter
mix is usually 1 portland, 3 peat and sand, poly fibers, silica fume. For the last layers I go 1:1:1 and add Elmer’s wood glue as a fortifier. Beginning to play with styrofoam armatures covered with drywall mesh and a concrete slurry. Waiting to get some white portland before I do anything big so I can try poly-chroming the finished pieces.