Cortinarius Uliginosus Dye Mushrooms – Limited Supply


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Cortinarius uliginosus, also called Marsh webcap, is a non-edible dye mushroom that yields a range of bright orange and gold on wool mordanted with aluminum potassium sulfate. Cortinarius uliginosus is part of the huge Cortinarius family and is sometimes referred to as Dermocybe uliginosa.

We offer dried, whole Cortinarius uliginosus caps and stems.  These have been responsibly foraged from an experienced collector and wetland restoration specialist. An iron mordant will also dramatically shift the color.

We asked Julie Beeler, founder of the Mushroom Color Atlas to dye some of our wool gauze with Cortinarius uliginosus and she was able to get a lovely light mango-orange with alum, and a deep gold with an iron mordant. Her specific dye recipe for Cortinarius is below.

The package size is approximately 25 grams which will dye about 25-50 grams of wool fiber a medium dark shade. Please note that mushroom dyes are easiest to dye on wool fiber, but will also dye other animal fibers and silk. If dyeing with cellulose or plant fibers such as cotton or linen, we recommend a tannin pre-bath, aluminum acetate and a calcium post-bath for best results.

Cortinarius uliginosus (Marsh webcap) Dye Instructions
  • Wool gauze is mordanted in Iron @ 2%  WOF, or in Aluminum Potassium Sulfate @ 15% WOF + Cream of Tartar @6% WOF
  • Use the dried mushroom, finely ground in coffee grinder at a ratio of 1:1 (one part dried mushroom by weight to 1 part fiber, or 50% wof.) Note that the coffee grinder is used for dyestuffs only. Please wear a mask when grinding mushrooms or other dry ingredients. 
  • Hydrate the mushrooms in 1 liter (1 quart) water warmed to 115 degrees( 46C). The ground mushrooms are dropped into the warm water and stirred.
  • Let the mixture steep for 1 hour in warm water around 115 degrees (46 C), occasionally stirred.
  • Next, strain out ground mushroom in a strainer lined with silk habotai or other straining fabric. The mushroom residue may be saved for eco printing or another extraction. 
  • Wet out mordanted wool fiber was then dropped into warm water and steeped for 1 hour in warm water around 115 degrees, stirred occasionally.
  • Julie also made lake pigments with the exhausted dye baths and created watercolors with the reclaimed pigments.
  • Julie says that this mushroom made an orange shade in the bath, so she didn’t shift it with soda ash as she did with the other Cortinarius, but I tried it with soda ash (approx. 1/4th teaspoon or 1 gram) and got a slightly darker, salmon shade.  Both are lovely!

Additional information

Weight 40 g
Dimensions 7 × 5 × 3 in


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