Cornell Mushroom Blog

This post was written by PLPA 309 student Randi W., who encouraged our class to try dyeing and collected some Pycnoporus, too.

Did you know that fungi can be used to make dyes? Perhaps that lovely carpet your grandmother had in her living room was dyed with lichens early in the 20th century? That’s right! Fungi, particularly lichens, have a long history as fabric dyes. That’s pretty neat, right? Well, we thought so too, and decided to try it out for ourselves in our Fungi lab. But before I tell you all about our lichen and mushroom (we used one mushroom too just for kicks) dyeing experience, I thought I’d share a brief history of dyeing with lichens for it is something different.

Lichen dyeing has a long history, and by long I mean it was first mentioned in the Bible (Ezekiel 27:7). It was apparently first used for red and purple dyes by the people of Tyre thousands of years ago. The desired orchil purple colors were derived from Roccella tinctoria, and other rock lichens of the same genus. Purple denoted and conferred regality and power in Roman times, and was very expensive. Red and purple together were a symbol of life. Tyrian purple, the desired color, was originally extracted from a marine mollusk, and initially, lichen dyes were used only as underdyes. However, as the mollusk population was depleted, lichens became the primary source of the valuable purples, for they also were found to have a natural affinity to woolen and silk textiles. Colors based on a lichen ground are called conchoid purples (Kok, 1966).

The techniques and knowledge for making orchil lichen dyes were great secrets in early times. The earliest known description of the preparation of orchil was given by Roseto in 1540. The process generally consisted of obtaining the desired lichen, adding it to stale urine and slaked lime, and waiting (Perkins, 1986) If the fermentation process occurred for too long, the color would spoil. Some of the dyes even produced a characteristic smell of violets that was typical of orchil. It was also discovered that by adjusting the alkalinity, different shades of color could be produced (Kok, 1966).

Once the dye was ready for use, the rest of the process was quite simple. Water was heated slowly and the dye was added once the water was lukewarm, and together, were brought to a boil. The yarn or cloth was submerged in the bath and slowly reheated to just below boiling, where the brightest colors were obtained. Usually the yarn or cloth was dyed several times to deepen the color. This was the typical method for dyeing wool, and the method for dyeing silk was a variation of this method. Lichen dyes were unique in that they did not require any mordant or intermediary agent to be taken up by the fibers. The use of mordanting substances, acids or alkalies, were sometimes used to vary the color in orchil dyeing (Kok, 1966).

Orchil lichen dyeing disappeared during the 3rd and 4th centuries. It gained popularity again during the 1300s in Europe. Boom and bust years over the next centuries were caused by depletion and regeneration of the lichens. Lichen dyeing was popular until the early 19th century, when it was replaced by chemical colors (Perkins, 1986). It was still used in the carpet industry as a dyeing agent of carpet yarn early in the 20th century, but has now been replaced entirely by synthetic dyes (Kok, 1966). Now there is little use of lichens in dying, which is probably a good thing for lichens since they grow radially at an average of only 0.4–0.5 mm per year (Perkins, 1986 ).

Now I would like to share my personal experience in dying with fungi. As mentioned, our class extracted (and we’re still extracting) dyes from fungi. Books by Casselman (2001), Bolton (1991), and the Bessettes (2001) were valuable guides. We used two different lichens: Parmelia sulcata, which was found abundantly on local black willows; and Evernia prunastri, which was given to us and is found in mountainous areas growing on conifers. I collected the mushrooms we used from Cornell’s Arnot Forest–they are actually polypores, or bracket fungi–Pycnoporus cinnabarinus. And I can assure you we did not devastate the lichen/mushroom populations at all!

The lichen Evernia prunastri contains orchil precursors. For it, we made a slurry of chopped and ground lichen and household ammonia (we opted not to use urine…). This dye is still in the soaking/agitating stage and will, unfortunately, not be ready for about 16 weeks, after which we are hoping for a purple color to appear.

Like most lichens, Parmelia sulcata does not contain orchil precursors, but this species is said to yield a clear yellow dye. It was carefully removed from the bark, then cut and ground into tiny pieces. The mushrooms were simply cut with scissors into tiny pieces. Next, baths were set up: Parmelia sulcata and Pycnoporus cinnabarinus were placed in glass containers, and water was added to make a slurry. Both were heated to just below boiling, simmered for an hour, then cooled overnight. After we strained the cooled liquid, we added washed wool and simmered it for an hour. That was it–no mordant was needed. We now have lichen and mushroom dyed wool!

Pycnoporus produced a golden-brown color (above, right)–we dyed a second batch in the depleted dye liquor, resulting in a lighter color. Parmelia sulcata gave a dull manila-yellow color (below)–not too exciting to look at, but hey, we now have locally produced wool that was dyed using fungi and that is pretty cool if you ask me! We are anxiously awaiting the maturation of the Evernia dye and hope that we will be successful in obtaining our lichen purple. The next step will be to figure out what to make with our fungus-dyed wool! Check out our pictures of the dyeing process!

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