Maria is explaining to her friends the printing technique that requires the use of glue, gum arabic, or shellac. What technique is she describing? The technique Maria is describing is called

silk screening

Explanation:

I got it correct in my test :)

photography had emerged as an elite art pursued by a few creative individuals for a few wealthy patrons. but now, said bauldelaire, it was succumbing to "the great industrial madness of our times." it was becoming a mass production industry that catered to middle-class tastes, including a taste for gadgetry. the stereoscope, the first 3d imaging system, had turned looking at photographs into parlor entertainment. a "thousand hungry eyes were bending over the peepholes of the stereoscope as though they were the attic-windows of the infinite.

i believe their role is to instruct certain sections on when they are to join and when they are to stop