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Wednesday, September 25, 2019

Dye Project: Weld Extract

For our final dye project this season we're using a commercial weld extract. Weld (Reseda luteola), also called dyer's weld, dyer's rocket, and dyer's weed, is found throughout the Mediterranean, Europe and North Africa. Weld grows as a weed by the side of roads and railroad grades. The yellow flowers and small green leaves produce beautiful shades of yellow.



This was my first experience using a commercial dye extract. Extracts are much faster to work with, since you skip the process of extracting the dye from the source material. I admit to missing that process, but the extract produced a wonderful fragrance, like a pot of herbal tea, which was satisfying.
My Example

Dyer's Weld (Reseda luteola)
Photo from Ixitixel project

Weld extract

I'm continuing to use our white cotton dish towels, which have been scoured using Synthrapol and soda ash. I'm also using oak gallnut powder as the mordant, and a bath of alum and soda ash as a brightener. This combination works well, but adds two days to the process. With some advanced planning, the processes of scouring, steeping in the gallnut mordant, and soaking in the alum and soda bath could be done in advance, so that the fabric is ready to dye whenever you are.

My Example
Oak galls (or gallnuts)

Tannin mordant from gallnuts

I used our patio for my outdoor atelier, but this project could be done in the kitchen using the hood fan for ventilation. For safety use a face mask when measuring out the fine powders so there is no risk of inhalation, and use rubber gloves when working with soda ash, which is caustic.

Outdoor studio

I followed this basic process, based on instructions from The Handbook of  Natural Plant Dyes by Sasha Duerr.
  • Day 1, soak fabric in water 
  • Day 2, soak fabric in tannin from oak gallnut (steep for 8-24 hours)
  • Day 3, soak fabric in alum and soda ash (steep for 4-8 hours)
  • Day 4, dye fabric with weld extract (simmer for 30-45 minutes, then steep overnight)
  • Day 5, rinse and air-dry fabric

For this project, temperature is important. For the best color results, the temperature of the alum and dye baths should be kept at a simmer that does not exceed 180 degrees F. (or 82 degrees C.). I used a candy thermometer to monitor the temperature, and added cool water to the bath to lower it as needed. Rotating the fabric in the dye bath periodically also helps regulate  temperature, and ensure the mordant, alum and soda ash, or dye is distributed evenly throughout the fibers of the fabric.

For best color, simmer at or below 180 degrees F. (or 82 degrees C.)

I ordered the weld extract from Maiwa in Vancouver, Canada, and used their instructions and information from Dharma Trading Company to figure out a good recipe (see The Maiwa Guide to Natural Dyes and Natural Dye Extract Kit (Instructions tab). For three cotton dish towels (WOF is 231 grams), use 9-14 grams (2-3 teaspoons) of powdered weld extract (WOF is 4-6%). I used 5% WOF:

12g weld extract  =  5% WOF
231g fabric              100% WOF

Dissolve weld extract in water

Add weld to dye bath

I prepared a paste of the weld extract and water, and added it to a pot of water, then brought it to a simmer (keeping it at or below 180 degrees. Next I added the pre-processed, wet dish towels to the dye bath. The towels simmered for 45 minutes, and then steeped in the dye bath overnight. 

Steep dish towels in dye bath

Rinse until the water runs clear

Hang dish towels to dry

The next day I rinsed towels until the water ran clear. I hung the towels to air dry, then ran them through the washing machine to set the color, then air dried again. I love the intense yellow color (although it would be fun to try to achieve a range of intensities in future projects). 

Preserve the dye for future projects

I preserved the excess dye in glass jars to use in future projects and labeled them. Weld can be used as an overdye with blue woad and indigo dyes, to achieve green. Stay tuned for more experiments in the seasons to come!



Wednesday, September 18, 2019

Algae Bloom on Bishop Lake

Bishop Lake is a man-made lake at Bishop Ranch in San Ramon. It is a well managed, and well cared for lake that is the  beautiful centerpiece for the landscape. A walking trail circumnavigates the lake, with lots of shade trees, benches, and interesting plants along the way for walkers to enjoy.

Algae bloom?

Fish and frogs live in the lake, and various waterfowl are attracted to its shores, including heron, geese, and ducks. We've had the pleasure to observe many batches of ducklings and goslings hatch and grow to quick maturity over the seasons. Submerged plants remove nutrients and maintain water clarity. Shoreline plants provide cover for insects and small fish.

Submerged plants in bloom

We're nearing the end of summer, and I've noticed what I would call "algae bloom" at the lake edge.  According to Wikipedia, an algae bloom (or algal bloom) is "a rapid increase or accumulation in the population of algae in freshwater or marine water systems, and is recognized by the discoloration in the water from their pigments".  I've also noticed that some of the submerged plants are now appearing in patches on the lake surface. Sounds like a job for The Beast of Lake Bishop!

Wednesday, September 11, 2019

In the Atelier: Michel Garcia

Welcome back to watching people work! Sometimes we can get new ideas for solving problems and performing tasks, just by seeing how other people do things. To learn more about the art and science of dyeing, we're watching a few accomplished dyers at work using YouTube videos. In the last video, we learned from Sachio Yoshioka of Kyoto, Japan (see In the Atelier: Sachio Yoshioka).

This time we're visiting the studio and workshops of Michel Garcia of Provence, France. He is a dyer, phyto-chemist (studies the chemicals derived from plants), and botanist. The Natural Dye Workshop posts four trailers that promote his workshops and DVDs. The trailers and DVDS are produced by Yoshiko I. Wada, the founder of Slow Fiber Studios (located right here in the East Bay). 




I'm including one of the trailers in this post, but recommend watching all of them. Even as promotional videos, you can learn a lot about materials, tools, and techniques used in dye projects. Following is what caught my attention!

Trailer I: Colors of Provence using Sustainable Methods

Garcia demonstrates working with two historical plant dyes, madder  (Rubia tinctorum) and indigo (Indigofera tinctoria). He compares historical dye techniques with more sustainable methods that don't use lead or other toxic chemicals. Different mordants can provide a wide range of results. He recommends using common household items like vinegar, lime, and alum as mordants; and demonstrates using guar gum syrup as a mordant for brush work and block printing.

He also demonstrates how to extract the sap from indigo leaves, making a simple infusion, similar to making tea. The infusion is strained and dried, and the pigment is extracted. Garcia challenges dyers to reuse dyes and mordant to the last drop, and work with what we have to achieve dramatic colors.

Trailer II: Colors of the Americas on Wool Fibers using Sustainable Methods

Garcia is enthusiastic about the dyes of Mexico, and Latin America's rich history of beautiful textiles. Ancient dyers in the Americas used indigo for blue, cochineal and lac (insects) for red, and various local plants for yellow. The traditional indigo recipe used indigo leaves, local lime juice, and organic matter (such as chopped cactus leaf) for dyeing. Over-dyeing was used to achieve some colors, such as dyeing first with red and then blue to achieve purple, or dyeing blue and then yellow to achieve green.

The Zapotec's used plants and cochineal with additives like lime juice to produce many shades of red. For sustainability, modern household waste, such as fruit skins, can be used to produce dyes. Tannins also come from ordinary sources like Quercus infectoria, oak gallnut, and Lengua de vaca, with additives such as local lime, natural alum, and pomegranate. He also notes that the colors produced from all these dyes have a natural harmony of color.

Trailer III: Colors of Europe

Back to Provence, Garcia demonstrates working with some of the plants available in Europe. He focuses on the historical plant dye, weld (Reseda luteola), from which you can produce a paste pigment as well as a dye. We also get a few shots of his studio with great storage, work tables, and appliances such as a blender, electric tea kettle, and burners. He describes how to extract the sap from flowers such as common garden flowers and the blossoms of the Pagoda tree (Sophora japonica) to make an infusion that produces a bright yellow.

You can see the phyto-chemist and botanist at work as he describes how to use the extractions in combinations with ferrous salt, alum salt, titanium, and gum to produce different colors and effects. He demonstrates block printing and silk screen printing using the natural dyes. He mentions the reds produced by insects from the Mediterranean and the Americas, and from the madder root (used in the ancient wall paintings in Pompeii as well as to dye fabric). Garcia describes using powdered pigments to make water colors, and demonstrates how to make plaster paint for a plaster wall.

Trailer IV: Colors of the Sea in Brittany

(Currently unavailable) Garcia reviews some of the traditional methods used to process indigo, such as drying leaves to create a paste that can be used for paint or dye, and composting indigo leaves to preserve for later use. The traditional approach uses lots of water. Instead he works with the dried, condensed leaves and uses far less water. He mixes colors that were used historically for hair dyes as well as for dyeing, including rhubarb, henna, alkanet, and safflower.

Garcia also shares his knowledge of the various natural mordants that are readily available in nature, including calcium chloride (sea salt and lime), soda ash (burned seaweed), shell lime and sugar. The class opens the gates for the huge garden of color that nature provides.

Studio Takeaways

In summary, here are a few of my takeaways from seeing Garcia at work in his studio and workshops. He uses various industrial gas burners (from small to large), which are portable and support multiple temperature settings. He uses glass beakers for some of his smaller dye projects. This is fantastic for demonstrations and dyeing yarn (I wonder how practical that would be for larger projects, like our dish towels).

He uses common items like wooden stir sticks (large and small), a hand blender, a variety of plastic and glass containers for mixing. His knowledge of chemistry serves him well; he squeezes in lime juice, crumbles up clam shells, and tosses in various salts. Best of all is his "just try it" attitude, and the many examples of beautiful colors that his experiments produce!

I hope you enjoyed this peek into Michel Garcia's atelier. If these trailers are informative, imagine how much more the DVDs would be (no, this is not a paid endorsement, just an appreciative response)! Seeing his workshop, tools, and processes makes me want to learn more and adapt some ideas for my home studio.

Wednesday, September 4, 2019

Pink Tunnel of Crepe Myrtle

We're nearing the end of summer, and many plants in the landscape are looking a little worn out. An exception is the crepe myrtle, also known as crape myrtle, which has been putting on a show for several weeks (especially in the hotter, inland regions of the East Bay). Enjoy this walk through several "pink tunnels" of crepe myrtle.




Crepe myrtle (Lagerstroemia indica) does well in the heat, and the intense colors of its inflorescence stand out out in the bright, sunny days of summer. Possibly the deep watering from winter rains, and the triple-digit heat waves agree with it!

Crepe myrtle inflorescence

Crepe myrtle buds

Recall that several years ago we followed the crepe myrtle through the seasons in Dublin, California (see Street Trees Through the Seasons – Crape Myrtle). Enjoy!

Crepe Myrtle tunnel