what did you use to craft this head?

i used regular clay to sculpt the face. then i cast the sculpture wit hydro-cal boutght at seattle potterey. then i took the sculpting clay out, in a bag sprayed with water so it doesent dry out, then i filled the new mould with a hard latex, after a number of hours when the latex has been dried by the absorbant mould on the inside i pour out the excess latex and let the latex dry for some time after then pull the cast and let it dry the rest of the way. im not sure which latex im using, but i can look tomorrow. i make these as my regular work