Kathy Hattori, Author at Botanical Colors

Mordant Monday: Sneak peek of a new product

Mordanted Sashiko Thread with Different Tannin Options! Now you have the convenience of using tannins and a pre-mordanted thread to create your own color palettes and who doesn’t love that? Pictured from Left to Right: Cutch and Alum mordant, Sumac and Alum mordant, Gallo-Tannin and Alum mordant, and PFD, unmordanted Sashiko Threads We’ve been busy adding to our very popular mordanted product line, and will be offering mordanted Sashiko threads using three different mordant variables. The light brown color is Cutch, a light brown tannin, the yellow is Sumac, a yellow-based tannin, the light cream is Gallo-Tannin, a “clear” tannin, … Read more

Mordant Monday: Q&A

Mordant Monday this week is all about questions: some are mordanting questions and others are the victims of spellcheck. I changed my mind How do I change a mordant after the fact? I have some wool and cotton fabrics with alum on them but I really want to have them mordanted with iron instead. Can I remove the alum and start with an iron base? Answer: Alum mordants are very durable and long-lasting bonds, and while there are a few substances that can weaken or damage them, using them would probably also damage the fabric and we don’t recommend this … Read more

Mordant Monday: In the clutches of Cutch

This week’s Mordant Monday explores another well known and important tannin: Cutch. Cutch is a wood dye from Senegalia catechu (formerly Acacia catechu), an acacia species that grows in South and Southeast Asia. The dye is both a colorant, and a traditional medicine. It is also the by-product from the manufacture of “katha”, which is a crystalline substance that is an ingredient in paan or betel nut leaf, which is an Indian mouth freshener and digestive. We’ve never tried paan, but we love cutch for its versatility and deep colors. It’s a sweet-smelling dye and the color yield ranges from … Read more

Mordant Monday: I’m Soy Happy!

In today’s Mordant Monday (excuse the awful pun – I found it online), we check out how to use soy as a binder for natural dyes and pigments. Before the widespread use of acrylic paints and mediums, artists had ingredients from the natural world to use for painting and printing on paper and canvas. They used a wide range of natural binders including tree sap, milk, egg, oils, minerals and other substances that helped pigments stay attached to substrates. In Japan, soybeans are the most common binder for textile work, and it serves as a sizing to add body to … Read more

Mordant Monday: Chestnut, Fustic, Iron and Indigo

This week’s Mordant Monday focuses on Chestnut. We used Chestnut extract in our gradation and absolutely loved the combination of Chestnut, Fustic and Iron with Indigo. This gradation is slightly different than our previous experiments. This time I did not overdye with a warm shade like Madder, to get corals and pinks. I wanted to focus on green and blue. Like previous examples, when a tannin is combined with other colors you can get exciting mixes and beautiful color blends that harmonize and are perfect for patchwork, creating gradations and stitching. If you are a yarn person, many of these … Read more

Mordant Monday: Myrobalan Magic

This week’s tannin exploration focuses on Myrobalan. I changed it up a bit this week by using our mordanted cotton bandana 6-pack as the base for exploring myrobalan. The convenience was a pleasant surprise and the colors came out beautiful. Myrobalan is a traditional cellulose tannin pre-treatment and dye, and used in Ayurvedic and traditional medicine. It’s an important color and used frequently in India and Southeast Asia. Myrobalan imparts a light yellow on cotton with a subtle light brown undertone, making it an ideal foundation for color overdyeing, and indigo combinations. Like our other examples, when combined with other … Read more

Mordant Monday: Gallo Tannin, Fustic and Madder Gradation

This week’s Mordant Monday focuses on Gallo Tannin, also known as Oak Gall tannin, or Oak Galls. We used the extract made from Oak Galls in our gradation, but a similar result comes from oak galls that have been crushed or pulverized. Gallo Tannin is one of the ancient tannins with many uses, including making black ink, leather tanning, and in traditional Asian medicine. It is the most commonly used tannin when mordanting with tannin + alum, as the color it imparts is very light, and it doesn’t show a strong undertone, like sumac or walnut or other tannins with … Read more

Mordant Monday: R U Mordant Curious?

For Mordant Monday, we answer your Mordant Questions and dive into everyone’s favorite topic: MORDANTS. Are you Mordant Curious? I received a great question about the mordants we carry. Like, you have so many. What is the difference? Does it really matter? Having a variety of mordant choices allows you as an artist to consider your materials before you start creating. For example: if you are dyeing a cellulose fabric, you can use aluminum acetate, or you can use a tannin pre-mordant and then apply aluminum sulfate as the mordant. They will give you different results. We’ve created a table … Read more

Mordant Monday: Spotlight on Sumac

Taking a little time to work more closely with tannins has been incredibly interesting! This week’s tannin exploration focuses on Sumac. Sumac is from the Rhus genus and its scientific name is Rhus coriaria. It’s native to southern Europe and western Asia where it is commonly known as Tanner’s Sumac or Sicilian Sumac. We are fortunate to have number of North American native sumac including Rhus glaubra, sometimes called Smooth Sumac, and Rhus typhina or Staghorn Sumac, known for its dramatic bright red berry clusters. The staghorn berries were used by indigenous people as a tea, and the bark, branches, … Read more

You Asked, Kathy Answered: What IS Calcium Carbonate?

YOU ASKED: May I ask what you mean by calcium carbonate? I read in your description of “calcium carbonate” you compare it to chalk. This confuses me because chalk is caso4•(H2O) while calcium carbonate is caco3. KATHY ANSWERED: What we call “chalk” in the US is Calcium Carbonate – CaC03, a powdery white material. The formula that you reference is Calcium Sulfate and it may also be called “chalk” but in the US, we commonly refer to it as “gypsum”. Calcium carbonate is used to mark soccer fields, as a dietary calcium supplement, an ingredient in antacids, and building materials! … Read more