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On Fri, 06 Jul 2018 18:27:16 +0000, Grant Edwards wrote:

> On 2018-07-06, Gene Heskett <gheskett at shentel.net> wrote:
>> In that case, I hate to say it, but your education is sorely lacking in
>> the fundamentals. Smelting for instance was discussed at length in the
>> high school physics books I was reading by the time I was in the 3rd
>> grade. Don't they teach anything in school anymore? Tanning leather for
>> instance involves a long soaking in strong tea, and doesn't name the
>> brand or genus of the tea, the important part was the tannic acid
>> content.
> IIRC, oack leaves/chips work well also.

But the *best* quality tanned leather was historically made from dog 
faeces, known as "pure" by the tanners of the time:

Members only:

But this might work for you:

Steven D'Aprano
"Ever since I learned about confirmation bias, I've been seeing
it everywhere." -- Jon Ronson