Why do we use handkerchief?

A handkerchief (/ˈhæŋkərtʃɪf/; also called a hankie or, historically, a handkercher) is a form of a kerchief or bandanna, typically a hemmed square of thin fabric which can be carried in the pocket or handbag, and which is intended for personal hygiene purposes such as wiping one’s hands or face, or blowing one’s nose.

What kind of fabric is used for handkerchiefs? What do you thin alkyd with? What are the curtains in a Theatre called? What artist wraps buildings? Jay Z vendeu marés? What clothes glows under black light? What is a permanent set in Theatre? How are Rembrandts three crosses and Vincent van Gogh’s The Starry Night similar? What are the elements of arts define each? Porque é que usamos lenço?