## 3 Results and Discussion
After each process, the stripes are extracted and their mean CIELAB coordinates and CIEDE2000 difference calculated. Results are presented in Tables 1-4. For the time interval considered the calibrations of the modified color charts present a moderate difference, all values remaining in a close range even between the least and most deteriorated state, in every case smaller than the acceptability threshold of CIEDE2000. The most stable material is the acid-free paper (Table 1), that undergoes practically no deviation, whilst the others still fluctuate, even if slightly. Nevertheless, the acid-free non-laminated paper presents the best balance on lower mean error (lower than the acid-free paper) with acceptable variation (Table 2). Figure 5: Accumulative evolution of the CIEDE2000 difference for the white patches along every measured point in time (2, 4, 6, 24, 48, 72, 96, 120, 144 h). Red: Acid-Free Laminated Paper; Blue: Acid-Free Paper; Green: Forex Smart; Black: Glasspack. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Hour** & **Stripe 1** & **Stripe 2** & **Stripe 3** & **Stripe 4** & **Stripe 5** & **Stripe 6** & **Stripe 7** \\ \hline
2 h & 1.017 & 0.594 & 0.0 & 1.787 & 0.896 & 0.022 & 0.047 \\ \hline
4 h & 1.017 & 0.594 & 0.0 & 1.787 & 0.896 & 0.022 & 0.047 \\ \hline
6 h & 1.017 & 0.594 & 0.0 & 1.787 & 0.896 & 0.022 & 0.047 \\ \hline
24 h & 1.017 & 0.594 & 0.0 & 1.787 & 0.896 & 0.022 & 0.047 \\ \hline
48 h & 1.017 & 0.594 & 0.0 & 1.787 & 0.896 & 0.022 & 0.047 \\ \hline
72 h & 1.017 & 0.594 & 0.0 & 1.787 & 0.896 & 0.022 & 0.047 \\ \hline
96 h & 1.072 & 0.595 & 0.0 & 1.779 & 0.851 & 0.022 & 0.047 \\ \hline
120 h & 1.072 & 0.595 & 0.0 & 1.779 & 0.851 & 0.022 & 0.047 \\ \hline
144 h & 1.072 & 0.595 & 0.0 & 1.779 & 0.851 & 0.0225 & 0.047 \\ \hline
**Mean** & **1.035** & **0.594** & **0.0** & **1.784** & **0.881** & **0.022** & **0.0** \\ \hline
**Variance** & **0.001** & **0.0** & **0.0** & **0.0** & **0.0** & **0.0** & **0.0** \\ \hline \hline \end{tabular}
\end{table} 
Table 1: CIEDE2000 differences for the seven tested calibrated color stripes for the acid free paper. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Hour** & **Stripe 1** & **Stripe 2** & **Stripe 3** & **Stripe 4** & **Stripe 5** & **Stripe 6** & **Stripe 7** \\ \hline
2 h & 1.108 & 0.712 & 0.949 & 1.241 & 0.950 & 0.0 & 0.0 \\ \hline
4 h & 0.155 & 0.077 & 0.0 & 0.073 & 0.153 & 0.0 & 0.0 \\ \hline
6 h & 0.156 & 0.077 & 0.0 & 0.073 & 0.15 & 0.0 & 0.0 \\ \hline
24 h & 0.117 & 0.090 & 0.0 & 0.101 & 0.20 & 0.0 & 0.0 \\ \hline
48 h & 0.332 & 0.099 & 0.0 & 1.66 & 0.53 & 0.0 & 0.0 \\ \hline
72 h & 0.358 & 0.086 & 0.0 & 1.66 & 0.51 & 0.0 & 0.0 \\ \hline
96 h & 0.358 & 0.086 & 0.0 & 1.66 & 0.51 & 0.0 & 0.0 \\ \hline
120 h & 1.021 & 0.588 & 0.0 & 1.77 & 0.890 & 0.0225 & 0.0453 \\ \hline
144 h & 0.358 & 0.086 & 0.0 & 1.66 & 0.51 & 0.0 & 0.0 \\ \hline
**Mean** & **0.44** & **0.211** & **0.105** & **1.1** & **0.49** & **0.003** & **0.005** \\ \hline
**Variance** & **0.121** & **0.056** & **0.089** & **0.535** & **0.076** & **0.0** & **0.0** \\ \hline \hline \end{However, it is interesting to note that the differences shown in the Tables 1-4 are not continuous, but they fluctuate at each time step. A reason for this can be understood when the \"white\" values for every paper are represented in their 3D color space (Figures A1-A5) and their evolution along time observed. The white tones, represented by dots in space, do not follow a linear evolution over time, but evidently fluctuate in space when under the chromatic deviation process, following an irregular evolution from the initial white tone in different directions during each time step. This is represented using arrows, as seen in the figures. For every paper, the arrows in the a\"L\", b\"L\" and a\"b\" planes (Figures A1-A4), and in the whole L\"a\"b\" space (Figure A5) are represented.