Source: youtube channel funfunfunfunfunfive, wikipedia "Paper
Marbling is a method of aqueous surface design, which can
produce patterns similar to smooth marble or other stone. The
patterns are the result of color floated on either plain water
or a viscous solution known as size, and then carefully
transferred to an absorbent surface, such as paper or fabric.
Through several centuries, people have applied marbled materials
to a variety of surfaces. It is often employed as a writing
surface for calligraphy, and especially book covers and
endpapers in bookbinding and stationery. Part of its appeal is
that each print is a unique monotype." The history of Paper
Marbling is said to originate in different parts of East Asia.
Known to be used in China, Persia, Ottoman Turkey, in Islamic
Empires then Europe.