DOI: 10.7910/dvn/o9pvxd
title: Replication Data for: The effect of prior exposure on the lightfastness of early synthetic dyes on textiles

description: &lt;h3&gt;Overview&lt;/h3&gt;
&lt;p&gt;This dataset provides calculated values of the light dose causing a just-noticeable difference (JND) in colour as a function of prior light exposure for approximately 100 dyed textiles. It quantifies the lightfastness of residual colours that remain after damage caused by past illumination. The analysis uses a published dataset [1] of colour measurements versus light dose for historic textiles dyed with early synthetic colourants during the period of 1874&ndash;1905.&lt;/p&gt;
&lt;p&gt;Detailed information regarding the samples and their sources can be found by cross-referencing ID numbers in the attached files with those of the previous study. Note that the classification of dye composition in the source data was based on cross-referencing trade name and manufacturer with the 1st ed. of the Colour Index. The material characterization may be validated or refined with ongoing chemical analyses.&lt;/p&gt;
&lt;h3&gt;Files&lt;/h3&gt;
&lt;p&gt;The following files are included in the dataset:&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;01 - Dose to JND vs prior exposure (Test batch 1_Samples 1-27).xlsx&lt;/li&gt;
&lt;li&gt;02 - Dose to JND vs prior exposure (Test batch 2_Samples 32-58).xlsx&lt;/li&gt;
&lt;li&gt;03 - Dose to JND vs prior exposure (Test batch 3_Samples 63-89).xlsx&lt;/li&gt;
&lt;li&gt;04 - Dose to JND vs prior exposure (Test batch 4_Samples 94-120).xlsx&lt;/li&gt;
&lt;li&gt;05 - Dose to JND vs prior exposure - all data resampled.xlsx&lt;/li&gt;
&lt;li&gt;06 - Example Calculations.xlsm&lt;/li&gt;
&lt;li&gt;07 - Blue Wool Ratings - Figure 6.xlsx&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;Files 1&ndash;4 give the calculated light dose causing a JND for the residual colour as a function of prior exposure. Each file represents a selection of samples from one of the four test batches. The fifth file contains a summary of results for all samples, with data resampled at a set of common dose values. This was necessary to generate Figure 6 in the related manuscript.&lt;/p&gt;
&lt;p&gt;The sixth file provides examples of how the calculations were performed using a macro-enabled Excel spreadsheet (.xlsm). The document contains VBA code for determining colour difference with the CIEDE2000 (&Delta;E&lt;sub&gt;00&lt;/sub&gt; ) method [2-4], and performing linear interpolation [5].&lt;/p&gt;
&lt;h3&gt;Resources&lt;/h3&gt;
&lt;p&gt;&lt;small&gt; [1] Hagan, Eric, Itxel Castro-Soto, Marianne Breault, and Jennifer Poulin. 2022. Replication Data for: The lightfastness of early synthetic organic dyes. Harvard Dataverse. &lt;a href="https://doi.org/10.7910/DVN/JQMYFM"&gt; https://doi.org/10.7910/DVN/JQMYFM &lt;/a&gt;. &lt;/small&gt;&lt;/p&gt;
&lt;p&gt;&lt;small&gt; [2] Sharma G, Wu W, Dalal EN. The CIEDE2000 color-difference formula: implementation notes, supplementary test data, and mathematical observations. Color Res Appl. 2005;30(1):21&ndash;30. &lt;/small&gt;&lt;/p&gt;
&lt;p&gt;&lt;small&gt; [3] brucelindbloom.com. Delta E (CIE 2000) [Internet]. March 24, 2016 [cited July 6, 2022]. Available from: &lt;a href="http://www.brucelindbloom.com/index.html?ColorDifferenceCalcHelp.html"&gt; http://www.brucelindbloom.com/index.html?ColorDifferenceCalcHelp.html &lt;/a&gt;. &lt;/small&gt;&lt;/p&gt;
&lt;p&gt;&lt;small&gt; [4] wikipedia.org. Color difference [Internet]. March 24, 2016 [cited July 6, 2022]. Available from: &lt;a href="https://en.wikipedia.org/wiki/Color_difference"&gt; https://en.wikipedia.org/wiki/Color_difference &lt;/a&gt;. &lt;/small&gt;&lt;/p&gt;
&lt;p&gt;&lt;small&gt; [5] wellsr.com. Powerful Excel Linear Interpolation Function with VBA [Internet]. March 24, 2016 [cited July 6, 2022]. Available from: &lt;a href="https://wellsr.com/vba/2016/excel/powerful-excel-linear-interpolation-function-vba/"&gt; https://wellsr.com/vba/2016/excel/powerful-excel-linear-interpolation-function-vba/ &lt;/a&gt;. &lt;/small&gt;&lt;/p&gt;