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Table 3 Quality criteria used by folk to assess indigo paste.

From: Quality blues: traditional knowledge used for natural indigo identification in southern China

Criteria

Folk quality levels

Guizhou

Yunnan

Fujian

1

2

3

4

5

FC/QI/FL

FC/QI/FL

FC/QI/FL

Color

Dark blue, deep purple-red

Dark blue, reddish

Blue

Blue-black, black

Light blue, bluish grey, turquoise

171/1.00/100%

70/1.00/100%

42/1.00/100%

Touch

Exquisite and smooth

Exquisite

Slight granular sensation

Granular sensation

Obvious granular sensation

20/0.12/12%

5/0.07/7%

9/0.21/21%

Taste

–

–

–

–

–

47/0.27/27%

2/0.03/3%

0/0.00/0%

Dyeing ability

Easy

Easy

General

Difficult

Hard

11/0.06/6%

3/0.04/4%

0/0.00/0%

  1. Note: – meaning that the folk description of this criterion in disagreement