Neanderthal Birch Tar - POC - first try and fail - 98% primitive

[november 2011] Trying to make prehistoric birch tar / birch pitch... + more information : http://experimental-prehistory.blogspot.fr/2016/01/neanderthal-superglue-from-birch-bark.html [[[also made a 2nd try, in year 2012]]] First experiment : trying to find how to make birch bark tar with very primitive technology : fire, cordage, wood, wood charcoal, birch bark, soil / mud, some clay, stone. After applying heat for some 2 hours, I apparently got some tar (very very few), but it didn't gather in the container. [Normally, it's a process of distillation, so the gas should also have gone in the container underneath and there it should have turned into tar ... or not ???] Things to change in the next experiment : - less time , less heat [or more ??]. - make a bit more neatly the clay enveloppe [while viewing the vid, I discovered that there was at least a hole in the clay enveloppe]. - make a small clay funnel to ensure that the tar will flow down [should not be necessary : the distillation creates a gas that should also go underneath and turn to tar]. - more heat at the basis of the clay enveloppe (and less on top ?). - have the strips of birch bark stand upright so that the tar can glide down along the strips [? no tar but gas where there is heat ?]. - use more bark (maybe fresher ?). - use wild cherry tree bark instead of birch bark ? Things that seemed OK : the 3 layered enveloppe (clay, leaves, mud). {tags in description : burns burning poix bouleau tar pitch abedul catrame pece betulla alquitran قطران זפת 乾留液 Дёготь 焦油 Берёста Туй neandertal }

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