Green Dyes
Why Green is difficult ?
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Extracting Green in Natural Dyes
Extracting Green in Natural Dyes
Why green is difficult
Why green is difficult
Green in plants mostly comes from Chlorophyll, a pigment that is:
Chemically unstable
Sensitive to heat, pH, light, and oxygen
This is why achieving a true, lasting green is one of the hardest challenges in natural dyeing.
Heat sensitivity of chlorophyll
Heat sensitivity of chlorophyll
When you boil leaves, the green turning yellow/brown is due to a chemical transformation:
Chlorophyll contains a magnesium (Mg) ion at its centre
Under heat + acidic conditions → Mg is removed
It converts into Pheophytin
Result:
Bright green → dull olive / yellowish tone
This is exactly why:
Boiling pandan, mango, or other leaves often gives yellow-green or brownish dye
Best extraction strategies
Best extraction strategies
A. Avoid boiling (key principle)
A. Avoid boiling (key principle)
Use cold extraction or low (~30–50°C)
Blend + soak instead of long boiling
B. Control pH
B. Control pH
Chlorophyll is more stable in neutral to slightly alkaline conditions
Avoid acidic water
You can:
Add a small amount of calcium carbonate (chalk) or baking soda (very minimal)
C. Use fresh material
C. Use fresh material
Chlorophyll degrades quickly after harvesting
Work with fresh leaves immediately
D. Short extraction time
D. Short extraction time
Long exposure = oxidation → colour loss
Why copper keeps green (but with caution!)
Why copper keeps green (but with caution!)
Mechanism
Mechanism
Copper acts by replacing magnesium in chlorophyll:
Forms Copper chlorophyllin
This complex is:
More stable to heat
More resistant to pH changes
Result:
Brighter, longer-lasting green
Less yellowing
Limits & risks of copper mordant
Limits & risks of copper mordant
⚠️ Toxicity concerns
⚠️ Toxicity concerns
Copper salts (e.g. copper sulfate):
Are heavy metals
Can accumulate in:
Water systems
Soil
Toxic to aquatic life
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