What is used in screenprinting to block areas from ink?

Screen printing is a printing technique whereby a mesh is used to transfer ink onto a substrate, except in areas made impermeable to the ink by a blocking stencil.

Solid ink printing: 1986

Screen printing: 1911

Inkjet printing: 1967

Printing press: c. 1440

Explanation:

Hope it helps :))

I believe the answer is a by using a blocking stencil