These are ground mimosa, quebracho, chestnut, and tara... a proprietary recipe is what distinguishes one tannery from another. The patina that often develops are the tannins coming closer to surface so can be a orangey or reddish or beige hue depending on tannin.
My personal favorite is tara tannin, extracted from a shrub native to South America. It has a pleasant almost milky smell, and tans leather with a very soft hand and a lighter color, so is used in tanning leathers to lighter shades.
Beauty is beyond the final product, but also in the making.
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