Table 4 Correlation analysis of element content and color in group 2.
Si | Fe | Ca | K | Mn | Cu | ||
---|---|---|---|---|---|---|---|
Number of cases | 22 | 22 | 22 | 22 | 22 | 22 | |
L | r | 0.242 | − 0.565** | −0.064 | 0.191 | − 0.569** | −0.239 |
Sig. | 0.277 | 0.006 | 0.777 | 0.396 | 0.006 | 0.285 | |
C | r | −0.001 | 0.547** | −0.303 | −0.144 | 0.004 | 0.049 |
Sig. | 0.997 | 0.008 | 0.17 | 0.522 | 0.987 | 0.829 | |
h | r | 0.371 | −0.32 | − 0.453* | 0.558** | −0.277 | − 0.482* |
Sig. | 0.089 | 0.147 | 0.034 | 0.007 | 0.212 | 0.023 | |
Si | r | 1 | −0.187 | − 0.676** | −0.119 | −0.348 | −0.401 |
Sig. | 0.406 | 0.001 | 0.598 | 0.112 | 0.065 | ||
Fe | r | −0.187 | 1 | −0.372 | 0.157 | 0.079 | 0.244 |
Sig. | 0.406 | 0.089 | 0.486 | 0.727 | 0.274 | ||
Ca | r | − 0.676** | −0.372 | 1 | − 0.451* | 0.273 | 0.269 |
Sig. | 0.001 | 0.089 | 0.035 | 0.219 | 0.225 | ||
K | r | −0.119 | 0.157 | − 0.451* | 1 | −0.2 | −0.052 |
Sig. | 0.598 | 0.486 | 0.035 | 0.373 | 0.819 | ||
Mn | r | −0.348 | 0.079 | 0.273 | −0.2 | 1 | 0.106 |
Sig. | 0.112 | 0.727 | 0.219 | 0.373 | 0.64 | ||
Cu | r | −0.401 | 0.244 | 0.269 | −0.052 | 0.106 | 1 |
Sig. | 0.065 | 0.274 | 0.225 | 0.819 | 0.64 |