Rhubarb Powdered roots (Rheum)

Wooden bowl filled with yellow powder on a white background

Rhubarb Powdered roots (Rheum)

$7.90

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Pickup available at eHouse Rishon

Usually ready in 24 hours

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Also known as Chinese rhubarb, Himalayan rhubarb, Turkey rhubarb.

Description
Rhubarb root powder is prepared from the dried roots of Rheum species, long valued as a traditional dye plant in China, Nepal, and across Central Asia. Rich in anthraquinones, rhubarb produces a versatile colour range from golden yellows to warm oranges and reds. It is easy to use on both protein and cellulose fibres, making it a favourite for dyers seeking a sustainable and renewable source of colour.

Historical Note
Rhubarb has been traded along the Silk Road for centuries, not only as a dye but also as a medicinal root in traditional Chinese and Tibetan medicine. In dyeing, its versatility made it a staple plant for producing yellows and rusts, as well as a useful tannin source to assist in mordanting.

Main dye compound: Emodin, Chrysophanol
CI Natural Yellow 23

Shading Tips

Alum + vinegar (acidic bath) bright yellow
Alum (neutral) golden yellow
Alkaline modifier brick red
Copper deep golden tones
Iron (post-mordant) green
Overdye with indigo emerald greens

WOF: 5–10%

Mordanting: Works well on protein and cellulose fibers. No mordant is needed but alum recommended for clearer yellows.

Active dye compounds: Emodin (anthraquinone), chrysophanol, oxalic acids, tannins

Bath conditions: Adjust pH for shade variations — acidic for yellows, alkaline for reds

Efficiency: 100 g will dye ~1 kg of fiber

Safety Note: Rhubarb root contains oxalic acid. Always dye in a well-ventilated space and avoid inhaling fumes or powder.
For external use only. Not edible.
Keep away from children and pets.
Wear gloves and mask when handling powders.
Avoid inhalation of dust and contact with eyes.