Dyeing Leather with Whole Mimosa Hostilis Root Bark
Tannin-rich barks and leather have gone together for centuries, and Mimosa hostilis root bark is among the richest. Used as a dye on vegetable-tanned leather, it gives warm red-browns and purple-browns that deepen with repeated coats. This guide explains a simple small-scale method using whole bark.
Why the bark suits leather
Tannins bind to the proteins in a hide. That is the basis of vegetable tanning, and it is also why a tannin-rich dye takes so well on vegetable-tanned leather. Chrome-tanned and heavily finished leathers take natural dyes poorly, so start with undyed vegetable-tanned leather.
Making the dye liquor
- Break about 100 g of whole bark into small pieces.
- Cover with roughly a litre of water and soak overnight.
- Simmer gently for an hour, then leave it to cool.
- Strain through a cloth. For a stronger liquor, simmer the strained liquid down to reduce it.
Applying it
- Wipe the leather with a damp sponge so it takes the dye evenly.
- Apply the cool liquor with a sponge or wool dauber in thin, even coats, or immerse small pieces completely.
- Let each coat soak in and dry before adding the next. Several light coats give a more even colour than one heavy one.
- Allow the leather to dry slowly, away from direct heat and sun.
- Finish with a leather conditioner or wax to restore suppleness and protect the surface.
Adjusting the shade
- More coats give deeper, browner tones.
- Iron water, applied sparingly, reacts with the tannin and darkens the leather towards grey and near-black. Test first, because the reaction is strong.
Tips
- Always test on an offcut from the same hide.
- Wear gloves; the liquor stains skin and surfaces.
- Keep leftover liquor in a sealed jar in the fridge and use it within a few days.
We stock whole root bark in sizes from 500 g upwards. For textiles, see how to dye fabric with shredded bark.
Common questions
What kind of leather can I dye this way?
Use undyed vegetable-tanned leather. Chrome-tanned and finished leathers resist natural dyes.
How many coats do I need?
Two to four thin coats usually give an even mid-tone. Let each coat dry before judging the colour, since wet leather looks darker.
Do I need to seal the leather afterwards?
Yes. Finish with a leather conditioner, wax or sealant to restore suppleness and reduce colour rubbing off.
How dark can I go?
Repeated coats give deep red-brown. A light application of iron water afterwards pushes the colour towards dark grey and near-black.
