Micro fading test for textile single yarns: a new methodology applied to the Reformation Tapestry to assess its sensitivity to light

Heritage Science

Table 4 Summary of measurements of RT samples.

Material	Dyestuff	∆E_{00, average}	σ	σ_rel %	BW_eq
Sample 6 Red—Wool	American cochineal	0.19	0.05	26	3.2
Sample 8 Rose—Wool	American cochineal	0.58	0.07	12	2.9
Sample 13 Brown—Wool	Madder, tanning agent: gall	0.52	0.04	8	3.0
Sample 14 Faded red—Wool	Redwood, madder	0.46	0.04	9	3.0
Sample 15 Yellow—Wool	Flavonoid	0.46	0.07	15	3.0
Sample 17 Faded red—Wool	Redwood, Traces of Alizarin (Madder)	0.63	0.04	6	2.9
Sample 20 Yellow—Silk	Weld	0.50	0.09	18	3.0
Sample 24 Red—Wool	American cochineal	0.27	0.02	7	3.2
Sample 25 Faded red—Wool	Madder, redwood, tanning agent: gall	0.96	0.09	9	2.6
Sample 26, Dark green—Wool	Woad or Indigo Weld	0.38	0.02	5	3.1

Results are given as average colour change (ΔE00, average), standard deviation (σ), relative standard deviation (σrel), and BWs equivalent (BWeq)