A black binder could be a polymeric material with a black color. Polymeric binders are substances that promote adhesion and cohesion in various materials. They are commonly used in the formulation of coatings, adhesives, and composite materials.It is also used in all type of incenses. 

Applications in Composites:

In the field of composite materials, black binders may be used to hold together reinforcing fibers or particles. This is common in the manufacturing of composite components used in aerospace, automotive, or construction industries.

Colorant or Pigment:

The black color of the binder may be due to the addition of pigments or colorants. This is particularly relevant in applications where the appearance of the final product is important, such as in the production of colored adhesives or coatings.