Olive oil was used to fire metalworking furnaces 4000 years ago in Cyprus http://news.yahoo.com/s/nm/20060309/sc_nm/cyprus_olives_dc_1;_ylt=An_Mtiqq_3wG6evokWOwdPxg.3QA;_ylu=X3oDMTA2ZGZwam4yBHNlYwNmYw-- Sharon gordonse at one.net