A yarn dyed with madder roots has a wealth of colour variation, whilst the same yarn dyed with its synthetic equivalent, alizarin, lacks this subtle variation in colour and can look very uniform.

• 例如，一根用茜草根染过的纺线会有着丰富的色彩变化，而同一纺线用人工合成的茜素染色后就没有这种微妙的颜色变化，甚至看起来颜色是一致的。