Take a look around line 3600 in your css and you’ll see the code for the Purple Skin Color –
.epik-purple .genesis-nav-menu a {
color: #fff;
}
.epik-purple .site-header .widget-area {
color: #eee;
}
.epik-purple .genesis-nav-menu a:hover,
.epik-purple .genesis-nav-menu .current-menu-item > a {
color: #d5a8ff;
}
.epik-purple .nav-primary .sub-menu a:hover,
.epik-purple .nav-secondary .sub-menu a:hover,
.epik-purple .site-header .sub-menu a:hover,
.epik-purple .site-header .genesis-nav-menu .sub-menu .current-menu-item > a,
.epik-purple .genesis-nav-menu .sub-menu .current-menu-item > a,
.epik-purple .genesis-nav-menu .sub-menu .current-menu-item > a:hover {
color: #8542c4;
}