From the page: Idle wood wants to become a piece
Idea 4
Iron mordant to ebonize wood
Ebonizing means darkening wood to the tone of ebony — a technique used by woodworkers since at least the 19th century for furniture with a noble look. The chemistry behind it is elegant: the acetic acid in vinegar dissolves iron, forming a liquid that reacts with tannin (a natural compound present in woods like oak, pine, and walnut). Where there is tannin, the wood darkens on its own, without paint.
What you need
- Steel wool, a rusty nail, or an old screw
- White vinegar (enough to cover the metal)
- Glass jar with a lid
- Brush or cloth
- Simple gloves
How to make it
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1
Place the steel wool or nail in the jar and cover with vinegar — the acid will "eat" the metal and load iron into the solution.
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2
Cover loosely (the vinegar releases gas) and wait one to two days, until the liquid darkens.
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3
Strain and apply with a brush over clean, sanded wood — on woods with little tannin, a prior coat of strong black tea (which is rich in tannin) darkens it much more.
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4
Watch the darkening for 30 minutes; if you want it more intense, apply another coat.
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5
Once dry, finish with wax or oil to seal.
Finishing touches
every wood reacts differently — test on a scrap first; the result goes from lead gray to deep black, with the grain highlighted.
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