Natural dyeing has been practiced in China for centuries, long before synthetic colorants transformed the textile industry. Leaves, roots, flower buds, petals, fruits and heartwood were prepared in different ways to create blues, yellows and reds on silk and other natural fibers.
One important point is that a plant does not correspond to one fixed color. Fiber type, mordant, pH, temperature, water quality, dye concentration and repeated dye baths can all change the result. In the guide below, the colors listed first are the most characteristic traditional results; process-dependent shifts are explained separately.
Six Traditional Chinese Plant Dyes and the Colors They Produce
1. Indigo — 蓼蓝 / 马蓝
Characteristic color: blue to deep indigo blue.
Indigo was one of the principal blue dyes used in historical China. Several indigo-producing plants were cultivated in different regions, including plants known historically as liao lan (蓼蓝) and ma lan (马蓝).
Indigo is a vat dye rather than a conventional boiling dye. The pigment must first be reduced into a soluble form so that the fiber can absorb it. When the cloth is removed from the vat and exposed to air, oxidation develops the blue. Repeated dipping gradually builds darker and more saturated indigo shades.
Color note: the characteristic result is blue. Very dark navy or blue-black effects require repeated dyeing, concentration, or combination with other processes; they should not be treated as the color of a single light indigo bath.
2. Gardenia — 栀子
Characteristic color: bright clear yellow to warm yellow.
The fruit of Gardenia jasminoides was an important yellow dye in ancient China. Historical and conservation literature describes gardenia as producing a bright yellow, particularly on silk.
Deeper dye baths can move the color toward a warmer golden yellow, but gardenia should primarily be understood as a yellow dye, rather than a green or orange dye.
3. Safflower — 红花
Characteristic red-dye colors: pink, scarlet, carmine and deep red.
Safflower (Carthamus tinctorius) contains both yellow colorants and the red colorant carthamin. Traditional red dyeing requires the water-soluble yellow components to be washed out before the red color is extracted.
This distinction matters. Properly prepared safflower was prized for luminous pink-to-red shades, especially on silk. Stronger reds could require repeated dyeing and considerable quantities of petals.
Color note: safflower itself can also produce yellow or orange when its yellow components are used, but those are different preparations. For a traditional Chinese “red flower” dye recipe, the expected palette is pink through scarlet and deep red—not orange as the default result.
4. Madder — 茜草
Characteristic color: orange-red, red and crimson.
Madder from the roots of Rubia species is one of the oldest important red dyes associated with Chinese textiles. Research on historical Chinese silk describes madder used with alum to produce shades ranging from orange through red to crimson.
The depth can be increased through stronger or repeated dyeing. Compared with safflower, madder often gives a warmer, earthier red with greater visual weight.
Color note: brick-red and terracotta-like shades are plausible madder results, but the historical color family is fundamentally red—not brown. Excessive heat, water chemistry and process conditions can push the result toward duller or browner tones.
5. Pagoda Tree Buds — 槐米 / 槐花
Characteristic color: clear yellow to strong warm yellow.
The flower buds of the Chinese pagoda tree, Styphnolobium japonicum (formerly Sophora japonica), are rich in yellow flavonoid colorants and have long been used as a yellow dye.
With alum, the result can be a particularly bright yellow. Different mordants may mute or grey the color.
Important correction: pagoda tree buds should not be described as directly producing green as their standard color. Traditional green can be made by combining a yellow dye such as pagoda tree buds with indigo blue. In other words, yellow + indigo can create green; the plant dye alone is primarily yellow.
6. Sappanwood — 苏木
Characteristic color family: orange-red to vivid red; deeper purple or purple-black is mordant- and pH-dependent.
Sappanwood comes from the heartwood of Biancaea sappan (historically also classified as Caesalpinia sappan). It was an important red dyestuff in Asian textile traditions.
Recent reconstructions of traditional sappanwood dyeing on silk show a particularly useful distinction: the unmordanted dye can appear orange; alum can shift it toward a vivid red; iron mordants can move it into deep purple or purple-black.
Color note: wine, burgundy and purple shades are therefore possible, but they should be presented as process-dependent variations, not as the single inherent color of sappanwood.
A Simple Color Reference
| Dye material | Most characteristic result | Possible variations |
|---|---|---|
| Indigo 蓼蓝 / 马蓝 | Blue, deep indigo | Darker navy through repeated dips |
| Gardenia 栀子 | Bright yellow | Warmer golden yellow |
| Safflower 红花 | Pink, scarlet, carmine, red | Yellow/orange only with different use of the yellow components |
| Madder 茜草 | Orange-red, red, crimson | Brick/earthier reds depending on process |
| Pagoda tree buds 槐米 | Yellow | Muted/greyed with some mordants; green when combined with indigo |
| Sappanwood 苏木 | Orange-red to vivid red | Purple or purple-black with different mordants / pH |
Why Silk Shows Plant-Dyed Color So Beautifully
Silk is a protein fiber and has good affinity for many natural dyes. It often reveals small tonal differences very clearly, which is one reason plant-dyed silk can look unusually nuanced.
Before dyeing, the fabric should be thoroughly cleaned so that oils, finishing agents or residue do not interfere with absorption. For any new recipe, a small test swatch is essential before dyeing a full length of fabric.
Mordants Change the Color
A mordant is not simply a “fixative.” It can also change the hue. Alum often supports clearer or brighter shades, while iron frequently darkens, greys or cools a color. Sappanwood is a good example: an alum-mordanted silk can be vivid red, while iron can push the same dye toward purple-black.
For this reason, photographs and color charts should always be read as examples of a particular recipe—not as an absolute color promise.
Natural Color Is a Process, Not a Paint Code
Traditional plant dyeing is valuable precisely because the result is sensitive to material and method. Indigo develops through oxidation; safflower requires careful separation of yellow and red colorants; madder responds to mordant and repeated baths; pagoda tree buds give yellow but can participate in layered green dyeing; sappanwood can shift dramatically with mordant chemistry.
At CROSE Fabrics, we are interested in this relationship between fiber, weave, finishing and color. Plant dyeing offers a particularly direct way to see silk as a living material: one whose final appearance is created through fiber, water, time and handwork.
Natural dye results vary with plant source, fiber, mordant, pH, water and process. Always test a small swatch before dyeing a full piece of fabric.
