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MAKEWORKS
Inks/Fresh-Leaf Indigo
PlantAdvancedSafety: Moderate Risk

Fresh-Leaf Indigo

True blue — the hardest natural color to make.

Color
Soft sky blue
Yield
≈ 50 ml
Shelf life
Use fresh

Soak indigo leaves in water for days so bacteria release the color, then whisk in air to turn the liquid blue.

  • ▸Indigo is green inside the leaf — only oxygen turns it blue.
  • ▸It's a real fermentation, like sourdough but for color.
  • ▸Patience-heavy but produces a deep, lasting blue.

Steps

  1. 01

    Blend fresh leaves with cold water 30 seconds.

  2. 02

    Strain immediately into a jar — liquid will be green.

  3. 03

    Add a small pinch of soda ash and whisk vigorously to introduce air.

  4. 04

    The green will turn blue as indigo precipitates.

  5. 05

    Let settle, pour off water, and use the blue paste with gum arabic.

Materials
3
  • — A handful of fresh indigo or Japanese indigo (Persicaria tinctoria) leaves
  • — Cold water
  • — Pinch of soda ash (sodium carbonate)

Safety

Moderate Risk

Involves dust, mild chemistry, sharp tools, or solvents. Use PPE and ventilate.

Hazards identified
  • Dye mordant — skin and stain hazard
Quick checklist
  • ☐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

True blue is rare in nature. Patience and air are the key ingredients.