I have been meaning to post a few photos of the tanning I wrote about in The lure of experimentalism. Here they finally are; with many thanks to Fiona McCullough. The top photo shows the hafting of a replica of a late mesolithic scraper, as found at the site of Arconciel/La Souche, with vegetable tar and synthetic sinew on a hazelwood stick. This turned out to be remarkably easy and robust.
On the photo below Fiona and I are scraping one of the sheepskins. This skin had been dried for a while. Fiona is using a hafted scraper, I am trying an un-hafted scraper, which was far less effective than the hafted tools.
Below, I also added a photo of Matthias Bollinger’s and my attempt at making birch-tar . We used two cans, one as a container, the other one as a lid. The lid was perforated a few times to allow steam to escape. The can (400ml) was packed, although not too tightly, with birch-rind and produced ca. 3 cubic cm of tar.