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Sodium hydrosulphite (hydros) 100g – sorry, this product is no longer available


Out of stock


Sodium hydrosulphite is no longer available. Thiourea dioxide (‘thiox’) can be used in the same way and in the same quantities.

Click here to purchase thiourea dioxide.


Sodium hydrosulphite, also referred to as ‘hydros’ or under the brand name spectralite is an effective, oxygen-reducing agent for use in indigo and woad (vat) dyeing.

Used in conjunction with sodium carbonate (‘soda ash’) it is reliable and straightforward to use.

Can be used as an alternative to thiourea dioxide (‘thiox’).

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