Rust / MetalEasySafety: High Risk
Rust & Vinegar Ink
Soak rusty nails in vinegar — instant iron mordant.
Color
Pale grey to deep black on tannin
Yield
≈ 200 ml
Shelf life
Indefinite
Drop rusty nails or steel wool into vinegar and wait a week. The brown liquid is your ink.
- ▸Vinegar dissolves iron from the metal.
- ▸When the iron-vinegar touches something tannic (wood, paper, coffee) it darkens to black-grey.
- ▸This is also the secret to 'ebonizing' wood furniture.
Steps
- 01
Place rusty nails or steel wool in a jar and cover with vinegar.
- 02
Leave 1–2 weeks until the liquid is orange-brown.
- 03
Strain off the iron-vinegar liquid.
- 04
On its own it writes pale grey; brush over a tannin (tea, coffee, oak) for deep black.
Materials4
- — Rusty iron nails or steel wool
- — White vinegar
- — A glass jar
- — Optional: brewed black tea (for tannin)
Safety
Involves caustics, acids, or open flame. Full PPE and trained supervision recommended.
Hazards identified
- Acidic / corrosive etchant
- Dye mordant — skin and stain hazard
Quick checklist
- ☐Wear goggles, apron, and acid-resistant gloves
- ☐Always pour acid into water, not the reverse
- ☐Neutralize and dispose per local hazardous-waste rules
- ☐Wear gloves and an apron — stains are permanent
- ☐Use dedicated pots, never cookware
- ☐Work in a ventilated area; keep food and drink out of the studio
- ☐Read each material's safety data sheet (SDS) before starting
- ☐Have water, soap, and a first-aid kit accessible
Heuristic guidance derived from listed materials. Always consult each material's safety data sheet (SDS) and a qualified instructor before attempting.
Notes
The base of all iron-gall inks. Keep loosely capped — gases off.