Why did artists use blue paint for certain figures

Which of the following composers was spanish a. lassus b. victoria c. tallis d. palestrina

To make an etching the artist first coats the entire printing plate with an acid-resistant substance called a made from beeswax, asphalt, and other material. the artist then draws on the coated plate with an etching needle exposing the metal. next the plate is dipped in the plate is removed, the waxy coating removed, and the plate is cleaned, inked and printed.

Periods in art and music history generally mark