The Elder Sign
This is the version used by August Derleth and Chaosium. I first took two pieces of soapstone. I then carved the image in reverse and backed it onto the other stone.
Using lead free pewter in a cast iron bullet casting ladle, I brought the unholy metal to a liquid state and poured it into the mold.
After removing it, I bathed it in some chemicals to change its color and patina.