| http://www.w3.org/ns/prov#value | - The difference with bottle glass and obsidian or flint is that you start by striking off a large flake with obsidian or flint and working that into a point, with bottle glass the base or shard from the side is your flake and you flake that down further to make your point, and the a flake looks nothing like a shard or bottle base so your technique is a little different but basically the same.
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