Does Nepal make its own pigments by hand?

Nepal makes its own pigments by hand. Nepal often can't buy more pigments because of its backward economy, so it chooses to make them by itself, using precious minerals or rare plants. Its preparation is completely manual, and the process is slow and complicated, even related to human strength. For example, white and yellow can be polished by young people, and blue and green need to be polished slowly by the weak. Moreover, bone glue and a little bovine bile should be added to the paint to prevent corrosion. So Nepal makes its own pigments by hand.