ALUM MORDANT (Potassium Aluminum Sulphate Dodecahydrate) ~ necessary for most plant dyes to ensure colour fastness.

Alum is considered the least harmful or safest when it come to mordants used in plant dyeing. What many don't know is that Alum occurs naturally in nature and some plants, like horsetail, contain Alum.

For mordanting Cellulose fibres, please choose one of the following recipes on our blog:

How to mordant linen and cotton fabrics successfully – AppleOak FibreWorks

How to mordant Linen and Cotton successfully without Tannins – AppleOak FibreWorks

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Basic recipe for wool:

Weigh your DRY textile material.

Soak your dry material.

10%-20% Alum (D.W.F. = Dry Weight of Fibre)

Cold mordanting:

Dissolve Alum in hot water, add to mordanting pot. Add your pre soaked wool and let sit for 24-72h

Hot mordanting:

Add 5% of Cream of tartar to your mordanting bath, to slow down the Mordant uptake. Add wool and bring to 80C for 1h. Let cool.

Rinse and dye or dry for later use.

Oak Gall - harvested from the wild in Turkey 

Oak Gall, also known as oak apple was and is still used for making ink. We use it as a fibre Mordant, due to its high tannin content. Unlike other tannin, it doesn't stain the fibre.  

Oak Gall is available as whole, cut or ground.

SODA ASH ~ To change colour (PH indicator) and scouring cellulose fibres

No natural Dye Studio can do without Soda Ash. It may be used in small amounts to alter PH or used for scouring cellulose fibres. Soda Ash is alkaline and used to increase the PH in a dye bath as well as in an Indigo Vat. It also brightens yellows, especially Reseda and Sage.

Instructions:

In general Soda Ash can be dissolved in the  hot dye bath at 3-10%. It helps to increase the PH of the bath.

IRON MORDANT ~ Mordant, Colour Changer, increased light fastness

Iron (Ferrous Sulfate) is used alone as a mordant, influencing Colours and to increase light fastness when used in combination with other natural dyes.

Iron is best known for shifting yellows into greens, keep in mind that this is not given and doesn't work with every yellow plant dye, in which case it will be more of a brown. it is used to increase light fastness for weaker plant dyes, bu it will always sadden and/or darken the colours. 

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Basic recipe:

When adding Iron to your dye bath start of with 3% and use it at the end of your dye bath or as an after bath. Allow to oxidize for 10 min for full colour development.

*If you like your colours darker, increase the Iron amount by 1-2% at a time. 

**Leave for 10min than remove from dye bath - Iron will make wool brittle.

HYDROS ~ is the colour or oxygen remover used for indigo or woad vats.

Dithionite can replace Spectralite ( basically the same, but you would need less and it is more expensive).

Instructions:

A 10L Indigo Vat requests up to 50g of Hydros.

* Sprinkle over the Dye Vat to remove Oxygen - the Vat should turn a yellow green.

**Please be aware, that this is a chemical and to avoid a chemical reaction allways add Hydros to water and not Water to Hydros.

***Other words for Hydros: Sodium Dithionite, Thiourea dioxide, Thiox, Hydrosulfite Sodium.

Lime (calcium hydroxide) 

It is possible to create a vat from indigo, lime (calcium hydroxide) and over-ripe fruit such as dates relying on the chemistry of the sugars* rather than fermentation of the fruit. But it’s easier to simply use fructose shared in

Michel Garcia’s 1-2-3 recipe. It’s very simple: One Part indigo,two parts lime and three parts fructose, plus warmth.

*Fructose and glucose found in ripe fruit are reducing sugars; ordinary sugar – sucrose – is not a reducing sugar.