“…The relatively small sample sizes of the few studies providing quantitative extraction data (Watkinson, 1982(Watkinson, , 1983(Watkinson, , 1996Watkinson & AlZahrani, 2008) make statistical evaluation difficult. In the most recent study (Al-Zahrani, 1999;Watkinson & Al-Zahrani, 2008), the alkaline deoxygenated treatments extracted an average of 97-99% of the chloride ions present in objects. Such high extraction efficiencies have been questioned, as the potential exists for loss of chloride ions as HCl during the digestion phase of the experimental work (Scott & Eggert, 2009, p. 141;Schmutzler & Eggert, 2010).…”