Copper Sulfate is used as a mordant in natural dyeing processes. 

Copper sulfate will improve light fastness and was fastness for all natural dyes and changes the colour. It brings out the blue and green hues of the natural dye. Use with logwood for deep night blues, intensifies all yellow dyes to a more mustard hue. 


For use; weigh 4-5% of copper sulfate per 100grams of dry goods, dissolve in hot water and top off with cold water to cover the fibers. As low as 2% will work, try and see the difference for yourself.

Let the fibers sit in this mixture overnight, stir in between. Or heat for 1-2 hours to below a simmer.


About toxicity of copper sulphate read here.



Copper sulfate pentahydrate

    By signing up for the newsletter you will stay up to date about our releases, blogs and specials. 10% discount on your first purchase of natural dyes.


    All rights reserved, copyright all images and text @Suzanne Dekel/DekelDyes

    • Facebook
    • YouTube
    • Pinterest
    • Instagram