Replication Data for: The lightfastness of early synthetic organic dyes

This dataset provides lightfastness data for textiles dyed with early synthetic dyes, using historic sources from 1874 to 1905. Diffuse reflectance measurements were taken as a function of light dose (Mlxh) during exposure to a warm white (3200 K, 95+ CRI) LED illuminant at 20 klx. Calculated colour values are given using D65/2° viewing conditions, for samples measured over black and white backgrounds. Colour change was examined as a function of light exposure using the CIEΔE2000 formula. Lightfastness was assessed as the dose causing a just-noticeable difference (JND). A JND was defined as a colour change equivalent to ISO 105-A02 Grey Scale 4, using ΔE00=1.7 as an equivalency. A table of of metadata for the test samples is also provided. Note that the chemical classification and associated Colour Index (CI) information is based on assumptions made during cross-referencing of trade names and manufacturers with the first edition of the CI. Some corrections/amendments may be made following chemical analysis of the respective materials.