Mordanting--wool and other protein
Mood:
rushed
Topic: Natural Dyeing
I'm busy mordanting skeins for my upcoming workshops in Helena at MAWS. I love teaching. It stimulates me, forces me to get things done, and I learn more than my students. Plus I get a lot of seeing lightbulbs go on in students head--very fun. But I DO NOT LIKE WORKING SO HARD TO GET ALL THE KITS READY. Anyway.
Mordanting wool, silk, and other protein fibers. There are five common chemicals used for mordanting protein fibers: alum, iron, chrome, copper, and tin. Alum sulfate is the most common and least toxic. Many people also mordant with iron, a non-toxic mordant, but it is very hard on the wool. I do not use iron as a mordant but do brief afterbaths to change the color of some goods. I do not use chrome although many natural dyers do due to the environmental and health concerns. Carol Lee gives a quite good explanation of the change in chemical properties of chrome and how they are safer than many perceive. I have a lot more to explore before I need chrome, so I just play it safe. I use tin, however, which is not near as risky and creates very bright colors. I have also only used copper as an after bath.
How much mordant is the right amount. There are two schools of thought on how much mordant is sufficient. The more mordant you use the harsher feel to the wool. I follow the Trudy van Stralen school of mordanting which subscribes to less mordant. Many others use the Carol Lee/Carol Leigh formulas which are more traditional.
Van Stralen— Lee/Leigh
Alum Alum 10% WOG--2.5 Tbsp per # Alum 4 Tbsp per #
Tartaric acid 5% WOG 1 Tbsp per # Tartaric acid 1 Tbsp per #
Tin Tin 0.5 %WOG Tin ½ tsp per #
Tartaric acid 5% WOG 1 Tbsp per # Tartaric Acid 1 tsp per #
Iron Uses as afterbath only Iron 1 tsp per #
Dissolve the mordant in very hot water and add. Dissolve the tartaric acid) in very hot water and add.
3. Add wet fiber Bring fiber up to 175 degrees for silk and 200 degrees for wool. Cook for 1 hour. Cool for one hour or overnight (not necessary if cook more than 1 hour). Rinse fiber in water. The rinse water should be the same temperature as the fabric or yarn to avoid felting. So if goods are still hot you need hot rinse water. Avoid agitation at all stages to prevent felting.
Back to tracing punch needle patterns for kits
Linda