St. Johns Wort Plant Collecting and Dye Bath

Amelia Hoskins / Dye Bath Processes, Plant collecting, Plant Dye / / 0 Comments / Like this
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St. John's Wort Ahimsa Silk Gold dyed
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St. Johns Wort yellow flowers in bank side.

Yellow Flowers of St. John's Wort (hypericum perforatum) are found along grass verges. I discovered them along the Tarka Cycle Trail on embankment which borders the River Torridge North of Bideford.

The Tarka Trail old rail track - Barnstaple to Bideford was my 10 mile route for foraging - using Jenny Dean's plant spotter book. Late summer finds many of the traditional dye plants along grass verges, especially in areas untouched for ages.


Dye Bath Procedure

  • Soak flower tops overnight in rain water. I use pond water.
  • Boil up and simmer for an hour
  • Cool liquid until hand hot, not to roughen silk, soak silk, stirring occasionally.
  • Leave overnight to absorb dye colour
  • Dye a second piece of silk using up remainder of dye
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1st silk absorbs good colour
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2nd silk uses up remainder dye

Second dye bath

  • First dye bath absorbs a lot of colour.
  • Second silk piece added on top through the night.
  • 2nd day: Remove first stronger dyed silk piece and rinse out, not squeezed too much and leave to dry.
  • Drain seeds and flowers and heat remaining paler dye bath. Add second piece again for half a day.
  • Rinse out when water completely clear. Colour was blotchy, so I cut it in half.
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Wet silk after washing out
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Wet silk hung to dry
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Silk wet from dye bath after iron (Ferrous sulphate) was added.

Olive Green/Khaki Results

  • I heated dye bath again, allowed to cool, before adding tablespoon of ferrous sulphate for third final piece of silk. (for khaki colour) Silk must not be exposed too long to iron mix as can weaken it. Colour change is immediate so 5 mins sufficient; less to just dull colour.
  • Silk dyed with no mordant = GOLD.
  • Silk modified after dyeing with iron = KHAKI
  • Notebook:  I bought the iron (ferrous sulphate) specially, but you can make your own. I generally experiment with adding water from a jar of rusty nails and screws; about half a tea cup to turn grey or khaki. Top up jar as rusty liquid is used. Even a spoonful dulls a colour adequately
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Dye bath gone green after iron is added
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Silk washed out after ferrous sulphate dye bath dip
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St. Johns Wort dyed silk contrasted with woad pale and darker
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Three varieties with St. John's Wort dye bath. L-R (a) first strongly dyed silk - (b) Second paler dyed silk (c) Third dyed silk after iron dipping as iron modifier produces khaki.

[Note: Post restructuring: additional dye images being resized]

See more and others' dye procedures on my Natural Plant Dye Pinterest Board.

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