Here you find basic information about Oogst mordants!

What is Mordanting?

For most of natural dyes it is necessary to prepare your fibers or fabrics for the dyebath.

This process is commonly called mordanting. Mordants are substances that open the fibers that you want to dye and prepare them for the coloring process.

Although the materials we use are safe, we advise you to wear gloves and preferably goggles. Even natural materials can irritate your skin or eyes and we believe in safety first!

Where our materials are hazardous (rarely) we will mention it on the product!

Do you always need to mordant?

It is not always necessary to use a mordant. Some dyes are so potent that they will always color the fibers and fabrics.

For instance, walnut bolsters give off enough color to usually not need a mordanting process first.

This opens opportunities for experimentation. You can mordant part of your materials and not mordant another part and see how the color takes differently on the two lots!

What mordants could you encounter in recipes?

Calcium hydroxide

Calcium hydroxide (E526), also known as slaked lime can be used to neutralize acid.

Arrowroot Starch

Arrowroot Starch can be used as a binder. Can withstand acid and remains bound after reheating and freezing.

Citric acid (E330)

Citric acid (E330) can be used to influence the acid level.


Fructose is an Antioxidant. Fructose helps for example indigo to bind to the fiber.

Iron sulfate

Iron sulfate (FeSO4) is a mordant and color influencer. 


The main component of Potash is potassium carbonate and it is used to regulate the acidity (pH value).

Tartaric acid

Tartaric acid is a good addition for example to a cochineal dye bath. 

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Texel, The Netherlands

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