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How to Mordant

Our How To guides are intended to make the mordant dye process easy, from scouring your fibers to dyeing with an assortment of dyes. You can find other How To guides here. What is Mordanting? Mordanting is the most important process of preparing fibers to accept color. A mordant is a mineral salt that fixes with the fiber allowing natural dyes to bond to it. For us it is the most important step to improve light and washfastness. Using a mordant helps to ensure the most durable and long-lasting colors. With the exception of indigo (as a vat dye, it … Read more

MORDANT MONDAY: Non-Toxic Mordants + Brightening Color

We get mordant questions all the time at Botanical Colors so why not create Mordant Monday??? Got mordanting questions? Email [email protected] YOU ASKED: I am sure you have received this question a bunch but I am curious, is the new cold water mordant Aluminum Triformate you are selling considered to be just as good as Aluminum Potassium Sulfate? Is it also considered to be just as “non toxic” as far as natural mordants go? KATHY ANSWERED: Aluminum triformate seems to work as reliably and well as Aluminum Potassium Sulfate. It is more acidic than APS, so we always rinse after … Read more

MORDANT MONDAY: Cloudy Mordant & Eco Printing Fabric

We get mordant questions all the time at Botanical Colors so why not create Mordant Monday??? Got mordanting questions? Email [email protected] YOU ASKED: I think I purchased the wrong mordant, according to the chart on your website. I have a cotton tea towel and I purchased aluminum potassium sulfate. I plan on eco printing some flowers on it, do I need to purchase a different mordant? Also, this is my first time! KATHY ANSWERED: You can also use aluminum potassium sulfate on cellulose fibers for eco printing. The best technique is to try to traditional tannin-alum mordant which uses aluminum … Read more

MORDANT MONDAY: Tannin Mordanting Cotton & Stiff Wool

We get mordant questions all the time at Botanical Colors so why not create Mordant Monday??? Got mordanting questions? Email [email protected] YOU ASKED: I’m getting ready to dye vintage cotton runners. I have aluminum acetate, which tannin powder would you recommend? Weight of fiber protocol?I have a bag of wool roving and also trying to figure out the best way to handle. Last time I ran it through a dye bath it dried dull and stiffish. What do I need to do next? KATHY ANSWERED: The choice of which tannin is really up to your preference. We like to use … Read more

MORDANT MONDAY: Safe Mordant Disposal With Well Systems

We get mordant questions all the time at Botanical Colors so why not create Mordant Monday??? Got mordanting questions? Email [email protected] YOU ASKED: Am I right that a mordant bath is tired based on how many uses and the WOF? Safe mordant disposal for us rural artists with well systems and no municipal drain…do I need to neutralize with soda ash or is that step unnecessary? My tap water is ph6. Can I water plants or feed the spent bath to the spruce trees? KATHY ANSWERED: You can definitely recharge alum baths. We support that as a way to get … Read more

MORDANT MONDAY: Dissolving Aluminum Acetate + Re-Mordanting

We get mordant questions all the time at Botanical Colors so why not create Mordant Monday??? Got mordanting questions? Email [email protected] YOU ASKED: My aluminum acetate often does not completely dissolve even with boiling water. Do you recommend putting the undissolved mordant in the vat with the fabric/textiles or would you strain? My assumption is that by excluding the undissolved mordant, one is reducing the amount used for the WOF. KATHY ANSWERED: Aluminum acetate is tricky to dissolve, but it should eventually dissolve. Sometimes I leave it overnight and it dissolves completely. I do not recommend putting lumps of undissolved … Read more

MORDANT MONDAY: Mordanted Pieces Resist Wetting Out

We get mordant questions all the time at Botanical Colors so why not create Mordant Monday??? Got mordanting questions? Email [email protected] YOU ASKED: I love the fact that aluminum triformate works with cold water. When I let mordanted pieces dry until I’m ready to use them, I have a hard time wetting them out before submerging them in a natural dye bath. Do you have an explanation or any tips? KATHY ANSWERED: I’ve noticed that alum mordanted fibers and fabrics can sometimes resist rewetting, especially in cold water. I’ve had skeins that I put in a water bath to rehydrate … Read more

MORDANT MONDAY: Mordanting For Mixed Fibers + Blotchy Linen

We get mordant questions all the time at Botanical Colors so why not create Mordant Monday??? Got mordanting questions? Email [email protected] This week on MORDANT MONDAY… YOU ASKED: I tried the oak gall tannin and then symplocos method on linen and for the life of me I can’t get an even dye. The mordant looks blotchy. Not sure what to do. I get consistently blotchy pieces with linen. KATHY ANSWERED: Hmm. Unevenness in mordanting and dyeing can come from a number of bedeviling sources. The first thing that comes to mind is the cleanliness of the fabric. If the linen isn’t evenly … Read more

MORDANT MONDAY: Will Mordant Wash Out Without Tannin?

We get mordant questions all the time at Botanical Colors so why not create Mordant Monday??? Got mordanting questions? Email [email protected] YOU ASKED: I have been contacting a well-published natural dyer and they say that the aluminum mordants will be washed out of the fiber without pre-treatment with tannin. Do you have any theory why the triformate is able to mordant without a tannin ? Have you got any data on the wash and light fastness of the triformate on cotton? KATHY ANSWERED: Alum on cellulose performs better with a tannin pre-treatment. However, we have not noticed that the mordant … Read more

Mordant Monday: Can I Mordant after Dyeing?

YOU ASKED: Can I mordant after dyeing? I just returned from India, dyed a number of silk scarves and was told the I can mordant them after they have been dyed. I have been trying to find more details but have only read on your site about post-mordanting something that has already been mordanted? KATHY ANSWERED: There’s actually a technique that is practiced in Japan that is referred to as “middle mordanting”. The process is to immerse silk fabric in dye, then transfer it to a mordant bath, and then return it to the dye bath. It definitely deepens the … Read more