This is a handmade watercolor that combines a few pigments  and a metallic pearlescent add- in in order to get the perfect shade. 
 
Half pan of watercolor. 
 
This color is  Butterfly Wing Shimmer  and the shade is a beautiful transparent blue shimmery color! It would be perfect on butterflies, feathers, or anything that needs a pop of blue shimmer!  I am still learning how to photograph metallics and this one is more stunning in person!
 
I handmade and filled these containers so some natural settling and variation will occur.