A Guide to Safe Practice in Art & Design

7.9   Dyes

Careful selection and use is essential. Care should be taken to avoid accidental inhalation, ingestion or skin absorption. The following free textile information sheets are available from the Health and Safety Executive:

7.9.1    Dye Powders
7.9.2    Direct Dyes
7.9.3    Acid Dyes
7.9.4    Basic Dyes
7.9.5    'Procion' Dyes
7.9.6    Synthetic Mordant Dyes
7.9.7    Azoic Dyes
 

7.9.1    Dye Powders

Dye powders are very fine, and therefore dangerous if inhaled. They should be mixed when wholly immersed in water or, if this is not possible, a dust mask or respirator should be worn. Heavy-duty rubber gloves should be worn to avoid skin contamination. Cooking utensils should not be used, as they may retain potentially hazardous amounts of chemicals. Personal protective clothing should be worn and there should be no eating, drinking or smoking in a dyeing area. Only soap and water should be used to remove splashes from the skin, as chemical substances such as bleach or potassium mangate (VII) might break down the dyes into hazardous substances.

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7.9.2    Direct Dyes

Direct benzidine-type dyes are a component of all-purpose dyes. These may be toxic and care should be exercised.

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7.9.3    Acid Dyes

These are used for silk and wool, and are probably the least hazardous.

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7.9.4    Basic Dyes

These dyes, used for wool, silk and some synthetics, may cause allergic reactions.

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7.9.5    'Procion' Dyes

These are also known as fibre-reactive or cold water dyes. Reactive dyes are extremely reactive chemical compounds and are capable of reacting with body tissue. The respiratory tract is particularly sensitive to reactive dyes and allergic responses may occur. Symptoms may seem like hay fever or asthma, accompanied by swollen eyes.

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7.9.6    Synthetic Mordant Dyes

These may be used in dyeing wool, and the most hazardous mordant salt is potassium dichromate. Other metal salts such as chromium cobalt, copper and so on may be both toxic and corrosive, and it is recommended that alum (potassium aluminium sulphate) salts of tin or iron be used instead.

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7.9.7    Azoic Dyes

The constituent materials of these dyes, 'fast bases' (fast salts) and 'napthol', are highly reactive chemical compounds capable of causing dermatitis and other skin disorders.

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