Pan Pastel Blender

It's not needed for BJD purposes.
It's usually used to fade out a color, make gradients and blend it with others. Check out Youtube tutorials to see how it's used

 

I personally use the blender as a something I put down prior to brush work with watercolor or gouache so that it doesn't bead up.

 

MSC can be hydrophobic when fresh. so when you draw a line with a brush, using a water based paint like watercolors or gouache, the water can bead up instead of drawing a nice solid line. by placing powder down, it prevents that and you get paint actually following your brushstroke. in my case i use colorless blender but many others will brush white pastel powder over the area because it generally blends in.

this picture shows the difference of beading line work, and linework i did with placing powder down before the line work.
https://cdn.discordapp.com/attachments/799347596069044306/1099488426333585419/20230422_191419.jpg

 

Oh my goodness, this is such a gamechanger. THANK YOU. Even when not fresh I sometimes encounter that issue with watercolor/gouache and it never occurred to me to solve it using the colorless blender!

I also use it sometimes to lessen the intensity of a shade I put down and have sealed the layer already--not the best use but it helps sometimes.