Scraps of fabric hanging from a clothesline.

The onions, avocados, and herbs sat in the fridge, neatly packed in baggies that disguised their colorful potential. Each of these unsuspecting items could be used to dye fabrics.

I am a conservator of ancient art, so the use, production, and study of colorful dyes as pigments on ancient artifacts is an important aspect of my work. Now I had an opportunity to play around with items right in front of me, cooling in my fridge and growing in my yard.

Studies of painting materials from the ancient world have revealed a very sophisticated use of natural dyes as colorful pigments, going back thousands of years. Made from plants or insects, these were used not only to tint textiles but also to paint.

Striking examples of this use of color can be seen on mummy portraits, where dyes were mostly used to represent textiles. For example, two ancient mummy portraits in the Getty collection show dyes used in two ways.

Dark haired, bearded face of a man

Mummy Portrait of a Bearded Man, A.D. 140–160, Romano-Egyptian. Encaustic on lime wood, linen, 16 15/16 × 8 7/8 in. The J. Paul Getty Museum, Villa Collection, 73.AP.94. Digital image courtesy of Getty’s Open Content Program. Indigo-dyed linen in the circle

Dark-haired woman wearing a double-strand necklace and pink top

Mummy Portrait of a Woman, A.D. 175–200, Romano-Egyptian. Tempera on wood, 11 1/8 × 5 11/16 in. The J. Paul Getty Museum, Villa Collection, 79.AP.129. Digital image courtesy of Getty’s Open Content Program. Arrows point at madder and indigo pigment

Mummy Portrait of a Bearded Man has a strip of ancient linen still attached to it that is dyed blue with indigo. In Mummy Portrait of a Woman, the subject wears a bright pink tunic that uses a pigment (called a lake) made of dye from the madder plant. Her blue necklace is colored by indigo. In ancient times, garments like hers would have likely been dyed pink using madder.

Textile, dyeing, and pigment production was an industry in the ancient world. In addition to creating a well-developed process, ancient artisans were resourceful and many materials were recycled for other uses. It’s quite possible that the madder lake used to paint this portrait’s tunic was produced from textile dye baths.

Dye production was not a simple process. Manufacturing dyes and pigments in Egypt, for example, required importing materials from the Mediterranean (like madder root and the parasitic insect kermes) or from as far away as India for the deep blue of indigo. One very special and expensive colorant called Tyrian purple, obtained from the murex shellfish, was “farmed,” requiring thousands of animals to produce just one gram of dye. Whether from an insect, plant, or sea snail, all processes involved dye extraction and complex preparation to make them usable and permanent dyes or pigments. It was likely only the elite who wore brightly colored garments.

At home, I knew indigo and madder are dyes produced from plants, and I also looked to other natural materials to understand the dyeing process. Many plant materials, such as onion skin, avocado pits and skins, and indigo do not require a fixative (mordant) to attach to fibers and become permanent. That makes dyeing from home very easy.

Onion skin, avocado skin and pits, and sage sit on a wooden board on grass

Onion skin, avocado skin and pits, and sage can all be used to dye fabrics

Folded handkerchiefs and fabric scraps on a mesh garden table

Our dyed fabrics

My son, a high school senior hoping to become a fashion designer, joined me on this journey. Together we hunted for items and cooked up the materials to dye. We grabbed anything we could find: old T-shirts, cloth napkins, table cloths, and kitchen towels were all fair game.

In addition to trying possible methods of dyeing used in antiquity, like pomegranate, onion skins, and herbs, our current experimental goal was to see what range of colors we could achieve and how simple manipulations (such as changing the pH and adding iron) to the water would affect the final outcome.

We ended up with a wide range of reds, pinks, yellow, and tan, but our favorite technique by far was indigo dyeing (not from our yard, but in a nod to modernity, from a kit purchased through Amazon).

The process was magical, like developing photos. We dropped the white fabric into the bath, and when it came out, it appeared green. But as it was exposed to air, it transformed into a magnificent blue.

A silver pot of boiling water. A mesh bag of pits is held above it

Throwing avocado pits in boiling water

Squares of fabric, mostly pink, hang outside from a clothesline

Dyed fabrics hanging out to dry

While I am interested in ancient technology, my son has incorporated the dyed materials into his modern fashion designs. He mostly creates canvas clothing, and the possibilities for color and paint are endless. For me, my understanding and appreciation of color in antiquity has grown even further.

Blue fabric with tie-dyed designs hang outside on a clothesline

Dyed blue fabric hanging to dry

As a sea of blue stretched across our yard, I imagined the ancient dyer’s workshop, fabrics blowing in the wind with the Nile or the Mediterranean as a backdrop. Exploring nature’s colors not only illustrated the ingenuity of ancient artisans but also revealed their expressive desire for beautiful things.

This sustainable practice has also become part of contemporary fashion and design, a very good lesson for my son. For me, the lesson was a deeper appreciation of ancient artistic practices. The next time you throw those peels into your trash or compost bin, think about their potential and how color was first discovered and its effect on our daily lives. As Pliny the Elder wrote so long ago, “The most valuable discoveries have found their origin in the most trivial accidents.”

A Few Simple Things to Try

We’ve updated this post with a few very simple steps for dyeing at home with natural materials. Searching the internet and/or picking up a book on natural dyeing will better guide you through the process.

Producing dusty rose/red dye with avocado pits and skins

Start collecting avocado pits and/or skins, clean them, break the pits into smaller pieces and throw them in a one-gallon zip-lock storage bag in the freezer. Collect as many as you can until the bag is more than half full, about 10-20 avocados.

Fill a large stainless steel pot with water, bring to a boil and add the pits or skins. Boil for 60-80 minutes. Strain the liquid (I threw the pits into a stock bag making it easy to remove) into a second large pot. Add thoroughly washed and wetted natural fibers (cotton, wool, or silk) into the dye bath, keep heated for about 30 minutes, remove and let cool.

Let the fabric soak in the dye bath completely immersed for as long as possible, even overnight to obtain the darkest shades. Remove fabrics, wash with dish soap and cold water, and hang to dry in the shade. You should end up with a beautiful red to a dusty rose-colored garment.

Producing yellow dye with pomegranate skins

This is pretty much the same process as above. Collect the pomegranate skins from at least five or more large pomegranates. You can dry or freeze them until you have gathered enough material. Add skins to gently boiling water, let boil for 60-80 minutes, strain and add your presoaked textiles. Keep warm for 30 minutes, remove from heat, and let the fabrics soak for as long as possible (overnight) fully immersed. Remove, wash with dish soap in cold water and hang to dry in the shade. The final product should be a soft, warm yellow garment.

These natural materials do not require a mordant (fixative) but the addition of one (such as a pinch of cream of tartar) or simple manipulations to the bath, such as changing the pH (adding vinegar) or adding vinegar that had a few iron nails soaking in it, can have unexpected and wonderful results.

For beautiful indigo colored blues, Jacquard sells a kit that makes dying easy.

Experiment with other materials you might have hanging around, and have fun.