Experimental insights into alternative strategies of lithic heat treatment

Abstract

Conditions in which thermal fractures occur are explored experimentally, and the results are used to assess heat treatment strategies. We conclude that no single 'critical temperature' for thermal fracturing or heat treatment can be specified for any particular raw material, as has so often been attempted, because threshold temperatures exist in relationship to specimen sizes. Our experiments show that smaller specimens are resilient to greater ranges of temperature fluctuations than larger ones, and that by manufacturing/selecting specimens of smaller sizes there is more potential to heat them rapidly and to higher temperatures without producing thermal fractures. We hypothesize a continuum of heat treating strategies between a 'slow and steady' strategy, which has overwhelmingly dominated past experimental designs, and a 'fast' strategy, which has received much less attention. The paper discusses the economic and technological contexts to which different heat treating strategies might be suited.