25 August 2015, 10:32
Unless I missed it the article does not mention mixing Birch Tar with crushed Charcoal when using to fix things like arrowheads etc. If you use Birch Tar "neat" it becomes brittle when it hardens, the inclusion of charcoal makes the mixture more like Epoxy and it sets hard but not brittle.
just a tip.
just a tip.