Ancient Celtic metalworking?

Q.I've got a long list of questions on ancient Celtic metalworking form and technique. If anyone reading this has information about this I'd like to hear from you. Right now I'm interested in finding: 1) The particular mixture of clay, sand and dung that was used in forming the molds used to cast Celtic copper axes in the late stone age. What kind of clay was used? 2) Any information on hafting of Celtic projectile points, particularly the evolutionary changes occurring from copper to bronze to iron points, as well as details of edge forging the copper and brass ones. And information as to how often the central ribs were just on one side of the blade and how often they were on both sides.

A.According to my brother William Walker, who is a ceramic engineer at Alfred University the mold mixture would depend on local materials. He suggests that if you want to try to duplicate the process you start with equal parts of what ever clay, dung and sand is available. If the molds are not to be fired use less dung. There are surviving 7th c.jewelry molds from Dunad in Argyll but the articles I have read on them are more concerned with style than technique.

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