[Soapstone from Bethlehem Steel site]
This soapstone is limestone. Bethlehem Steel purchased soapstone from suppliers specifically to use for marking steel. Some pieces were green or gray, but usually white. They came boxes of 50 pieces, each about 4" long. There were also soapstone holders, much like a pencil holder, with a pocket...
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PAM Z 1231 .P2 no. 501