Write adverse effects of natural dyes.
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Most natural dyes are not particularly toxic in themselves, but they will not stick to fabric unless a mordant is used. Typically, a mordant is a heavy metal. Heavy metals are extremely toxic, and bad for the environment, as well. Alum is a relatively safe mordant that is often used with natural dyes.
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Harmful Effects – Natural dyes can also be harmful to some extent. Logwood has ingredients, hematein and hematoxylin, that can be have harmful effects when inhaled, ingested, or absorbed through the skin. Bloodroot, another natural dye source, can cause irritation and inflammation when inhaled.
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