## 3 Results  
### Variations in coloration of Wool Fiber With and Without Plasma Treatment  
The experimental results (Table 1 and Figure 1) demonstrate that the treatment of wool fibers with plasma and mordants induces significant modifications in the colorimetric properties of these fibers. The white fiber (LB) exhibited a lightness (L*) of 89.96. Upon exposure to plasma, a progressive decrease in lightness was observed, reaching values of 60.17 to 52.10 after 15 min of plasma exposure. The addition of mordants intensified this effect, further reducing the lightness to 46.32. Regarding the a* component, the plasma-treated fibers displayed a tendency towards reddish tones, with values ranging from 5.74 to 22.91 depending on the exposure time. This pattern was also evident in the fibers dyed with the mordants. In relation to the b* component, yellow tones were observed in the samples plasma-treated for up to 10 min, as evidenced by their negative values. However, after extending the exposure time to 15 min, the values became positive, indicating blue tones. The mordanted fibers had a value of \(-\)2.54, suggesting the presence of yellow tones. The highest chroma (C*) was recorded for the LP15 sample, indicating a higher color saturation compared to the other treatments. Samples LP5 and LP10 presented lower chromas, indicative of lower saturation. The results indicated that the white fiber (LB) had a hue angle of 98.35\({}^{\circ}\). Plasma dyeing significantly altered the tone to 323.13\({}^{\circ}\) (LP5), 350.73\({}^{\circ}\) (LP10), and 34.72\({}^{\circ}\) (LP15). Mordant dyeing (LM0) exhibited an angle of 346.36\({}^{\circ}\), shifting towards blue-violet tones. The LM0 samples demonstrated intermediate color saturation. Regarding the color intensity K/S, a gradual increase was observed as the plasma exposure time was prolonged, which was associated with the alteration of the dye concentration in the fiber due to the degradation caused by the APPJ plasma discharge. In contrast, the fibers dyed with mordants exhibited a higher color intensity K/S (4.18), which was attributed to the formation of a thin layer on the fiber surface. According to the correlation heatmap depicted in Figure 2, a strong negative correlation (\(-\)0.84) exists between the parameters L* and K/S, indicating an inverse relationship between the L* value (lightness) and K/S value (absorption and scattering coefficient). This observation suggests that the specimens with higher lightness exhibited lower dye absorption. A strong positive correlation (0.72) was observed between a* and C*, signifying that an increase in the a* value (red-green component) corresponds to an increase in the C* value (chroma). This demonstrates that specimens with higher red color intensity also exhibit higher color saturation. The correlation between b* and a* is weakly positive (0.23), implying a slight tendency for the a* value to increase as the b* value (yellow-blue com \begin{table}
\begin{tabular}{c c c c c c c} \hline
**Treatments** & **L*** & **a*** & **b*** & **C*** & **h\({}^{\circ}\)** & **K/S** \\ \hline LB & 89.96 \(\pm\) 0.29 & \(-\)2.13 \(\pm\) 0.09 & 14.26 \(\pm\) 0.46 & 14.39 \(\pm\) 0.43 & 98.35 & 0 \\ \hline LP5 & 60.17 \(\pm\) 0.80 & 5.74 \(\pm\) 0.26 & \(-\)4.30 \(\pm\) 0.56 & 7.18 \(\pm\) 0.54 & 323.13 & 1.05 \\ \hline LP10 & 53.19 \(\pm\) 0.88 & 5.94 \(\pm\) 0.22 & \(-\)0.97 \(\pm\) 0.39 & 6.03 \(\pm\) 0.19 & 350.73 & 1.82 \\ \hline LP15 & 52.10 \(\pm\) 0.82 & 22.91 \(\pm\) 1.18 & 15.81 \(\pm\) 0.45 & 27.88 \(\pm\) 1.17 & 34.72 & 2.20 \\ \hline LM0 & 46.32 \(\pm\) 1.26 & 10.60 \(\pm\) 0.32 & \(-\)2.54 \(\pm\) 0.59 & 12.21 \(\pm\) 0.55 & 346.36 & 4.18 \\ \hline \end{tabular}
\end{table} 
Table 1: Color parameters obtained from wool samples dyed with and without plasma treatment. ponent) increases, although this trend is not pronounced.