Mordants, Modifiers & Assistants for natural dyes

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	Wild Colours > Natural dyes shop > Mordants & assistants

	Buy Dye Mordants, Modifiers & Assistants


	We sell a variety of chemicals as mordants, modifiers, fixatives and assistants for your natural dyes and natural dye extracts, including alum, aluminium acetate, cream of tartar, tannic acid, & gallnut extract. More about mordants & chemical names here. Sodium dithionite is no longer available - read more here.

Alum 250 grams

Potassium Alum 250g for wool, cotton, silk & paper - save £6.50

£8.25

Myrobalan Extract 20 grams

(natural Tannic Acid) - dye wool & mordant cotton

£3.75



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Chalk 50 grams

Calcium Carbonate 50 gram - for madder & weld

£2.75

Chalk 250 grams

Calcium Carbonate 250 gram - for madder & weld - save £6

£7.75



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Cream of Tartar 50 grams

Cream of Tartar 50 gram for mordanting wool & silk

£2.95

Cream of Tartar 250g

COT 250 grams - save £6.50 - mordant wool & silk

£8.25



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Gallnut Extract 20 grams

(natural Tannic Acid) - dye wool & mordant cotton

£4.65

Slaked Lime 250 gm

Slaked Lime (Calcium hydroxide) 250 gm for some indigo vats

£7.15



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pH paper - 20 strips

pH paper book of 20 strips to check acidity in dyeing

£1.75

pH paper x200

10 pH paper books of 20 strips to check acidity - save £5

£12.50



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Soda Ash 50 grams

Soda Ash 50 gram - scour cotton & dye woad & indigo

£2.65

Soda Ash 250 grams - SAVE

Soda Ash 250g - scour cotton & dye woad & indigo - save £8.30

£4.95



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Hearts & Crosses greeting card

Buy Handmade Cards with Natural Dyes

£3.25



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Overseas (non-UK) orders read here for shipping charges

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Note: Larger orders of alum, soda ash and other mordants and assistants will be supplied in multiples of 200 gram or 250 gram packs for your convenience.

Instructions for using your mordants & assistants - click here

Confused about Chemical names - read more about them here

Read about the difference between FFP1 and FFP2 face masks here

Sodium dithionite (hydrosulphite/Hydros)
Unfortunately dithionite is out of stock and we are not re-stocking! We apologise for the inconvenience. As an alternative, try one of our fermentation vat methods for indigo and woad dyeing! - read the new pages!

You can also buy:-

dye extracts

natural dyes

handmade cards

dye seeds

Buy your natural dyes with Credit card, Debit card or PayPal

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How to contact us:-
Wild Colours natural dyes, Studio 319, Scott House, The Custard Factory, Gibb St, Birmingham B9 4DT, UK

Contact Teresinha for enquiries
Tel: +44 (0)7979 770865
email: info@wildcolours.co.uk


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	UK Shipping £4.95p on orders up to £100 & free over £100 in UK [shipping £2.95 on very small orders up to £2.95 in value] University orders are sent Tracked at £9.95 Delivery to Europe + rest of World click here Overseas orders sent by Tracked Airmail Special & Next Day Delivery Updated on 26 September 2025 Website & photos by Mike Roberts ©2006-25 Wild Colours natural dyes

Buy Dye Mordants, Modifiers & Assistants