Indigo powder extraction

Indigo powder extraction

The precipitation method is a way to extract pigments from indigo plants. The advantage of this method is that a very intense color can be extracted and the processing takes 2 or 3 days.
  The color is released through fermentation in water.


  • Indigo leaves 1kg
  • Hot water 30-40℃ 10L
  • Bucket for 15L
  • Slaked lime 10-15g
  • PH Meter


1.Collect 1kg of Indigo leaves.

Immerse the leaves in hot water at a temperature of 30-40°C.
Let the leaves steep for 3 days (72 hours) during the summer or 4 days in the autumn season.

3. After the designated steeping period, when the leaves have turned green brown, remove them from the water.

4. As the leaves steep, the water will turn a bright green color.

5. After steeping, add slaked lime to the mixture and measure the pH level. Mix the solution thoroughly until the pH reaches approximately 11. Use PH test paper.

5. Blend the mixture for approximately half or one hour until the foam turns blue. Continue blending until no more foam appears.

6.Allow the mixture to rest overnight. In the morning, carefully remove the upper layer of water. Filter the remaining indigo color.

7. Your indigo color will be ready for use.

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